diadem, hood, mitre

Boyd’s Bible Dictionary:

(turban). The priestly head-dress of linen, wrapped round the head, and bearing a frontal inscription, “Holiness to the Lord” (Ex. 28:4,36-39; 29:6; 39:28-304And these are the garments which they shall make; a breastplate, and an ephod, and a robe, and a broidered coat, a mitre, and a girdle: and they shall make holy garments for Aaron thy brother, and his sons, that he may minister unto me in the priest's office. (Exodus 28:4)
36And thou shalt make a plate of pure gold, and grave upon it, like the engravings of a signet, HOLINESS TO THE LORD. 37And thou shalt put it on a blue lace, that it may be upon the mitre; upon the forefront of the mitre it shall be. 38And it shall be upon Aaron's forehead, that Aaron may bear the iniquity of the holy things, which the children of Israel shall hallow in all their holy gifts; and it shall be always upon his forehead, that they may be accepted before the Lord. 39And thou shalt embroider the coat of fine linen, and thou shalt make the mitre of fine linen, and thou shalt make the girdle of needlework. (Exodus 28:36‑39)
6And thou shalt put the mitre upon his head, and put the holy crown upon the mitre. (Exodus 29:6)
28And a mitre of fine linen, and goodly bonnets of fine linen, and linen breeches of fine twined linen, 29And a girdle of fine twined linen, and blue, and purple, and scarlet, of needlework; as the Lord commanded Moses. 30And they made the plate of the holy crown of pure gold, and wrote upon it a writing, like to the engravings of a signet, HOLINESS TO THE LORD. (Exodus 39:28‑30)
; Lev. 8:9; 16:49And he put the mitre upon his head; also upon the mitre, even upon his forefront, did he put the golden plate, the holy crown; as the Lord commanded Moses. (Leviticus 8:9)
4He shall put on the holy linen coat, and he shall have the linen breeches upon his flesh, and shall be girded with a linen girdle, and with the linen mitre shall he be attired: these are holy garments; therefore shall he wash his flesh in water, and so put them on. (Leviticus 16:4)
).

“Diadem” From Concise Bible Dictionary:

Crown used by kings of Romania

“Mitre” From Concise Bible Dictionary:

The head-dress of the high priest. It was made of fine linen: to it was fastened by a lace of blue “the plate of the holy crown of pure gold,” on which was engraved “Holiness to the Lord.” This plate came across the forehead. The miter was emblematical of the upholding of purity, righteousness and holiness by the Lord Jesus as the Minister of the sanctuary, or holy place (Ex. 28:4,37,394And these are the garments which they shall make; a breastplate, and an ephod, and a robe, and a broidered coat, a mitre, and a girdle: and they shall make holy garments for Aaron thy brother, and his sons, that he may minister unto me in the priest's office. (Exodus 28:4)
37And thou shalt put it on a blue lace, that it may be upon the mitre; upon the forefront of the mitre it shall be. (Exodus 28:37)
39And thou shalt embroider the coat of fine linen, and thou shalt make the mitre of fine linen, and thou shalt make the girdle of needlework. (Exodus 28:39)
; Ex. 29:66And thou shalt put the mitre upon his head, and put the holy crown upon the mitre. (Exodus 29:6); Ex. 39:28,3128And a mitre of fine linen, and goodly bonnets of fine linen, and linen breeches of fine twined linen, (Exodus 39:28)
31And they tied unto it a lace of blue, to fasten it on high upon the mitre; as the Lord commanded Moses. (Exodus 39:31)
; Lev. 8:99And he put the mitre upon his head; also upon the mitre, even upon his forefront, did he put the golden plate, the holy crown; as the Lord commanded Moses. (Leviticus 8:9); Lev. 16:44He shall put on the holy linen coat, and he shall have the linen breeches upon his flesh, and shall be girded with a linen girdle, and with the linen mitre shall he be attired: these are holy garments; therefore shall he wash his flesh in water, and so put them on. (Leviticus 16:4)).
The word is mitsnepheth, and (translated “diadem”) occurs again in a remarkable reference to the “profane wicked prince of Israel,” which, though referring to the then king, Zedekiah, seems to point to the future Antichrist in conjunction with the Roman beast, for he is represented as wearing the mitre and the crown, which shall be removed. God will overturn, overturn, “until He come whose right it is: and I will give it Him” (Ezek. 21:25-2725And thou, profane wicked prince of Israel, whose day is come, when iniquity shall have an end, 26Thus saith the Lord God; Remove the diadem, and take off the crown: this shall not be the same: exalt him that is low, and abase him that is high. 27I will overturn, overturn, overturn, it: and it shall be no more, until he come whose right it is; and I will give it him. (Ezekiel 21:25‑27)). With this agrees Isaiah 28:55In that day shall the Lord of hosts be for a crown of glory, and for a diadem of beauty, unto the residue of his people, (Isaiah 28:5): “In that day shall the Lord of hosts be for a crown of glory, and for a mitre of beauty, unto the residue of his people” In Zechariah 3:1-81And he showed me Joshua the high priest standing before the angel of the Lord, and Satan standing at his right hand to resist him. 2And the Lord said unto Satan, The Lord rebuke thee, O Satan; even the Lord that hath chosen Jerusalem rebuke thee: is not this a brand plucked out of the fire? 3Now Joshua was clothed with filthy garments, and stood before the angel. 4And he answered and spake unto those that stood before him, saying, Take away the filthy garments from him. And unto him he said, Behold, I have caused thine iniquity to pass from thee, and I will clothe thee with change of raiment. 5And I said, Let them set a fair mitre upon his head. So they set a fair mitre upon his head, and clothed him with garments. And the angel of the Lord stood by. 6And the angel of the Lord protested unto Joshua, saying, 7Thus saith the Lord of hosts; If thou wilt walk in my ways, and if thou wilt keep my charge, then thou shalt also judge my house, and shalt also keep my courts, and I will give thee places to walk among these that stand by. 8Hear now, O Joshua the high priest, thou, and thy fellows that sit before thee: for they are men wondered at: for, behold, I will bring forth my servant the BRANCH. (Zechariah 3:1‑8), where Joshua the high priest, as a representative of the people, is delivered from the resistance of Satan, and is cleansed, a fair miter (tsaniph, a kindred word to the above) is set upon his head, and he is clothed with garments. The Lord Jesus as the BRANCH comes forth, and blessing follows.

Strong’s Dictionary of Hebrew Words:

Transliteration:
tsaniyph
Phonic:
tsaw-neef’
Meaning:
or tsanowph {tsaw-nofe'}; or (feminine) tsaniyphah {tsaw-nee-faw'}; from 6801; a head-dress (i.e. piece of cloth wrapped around)
KJV Usage:
diadem, hood, mitre

From Manners and Customs of the Bible:

Peer, “beauty,” is the same word that is rendered “bonnet” in Isaiah 3:2020The bonnets, and the ornaments of the legs, and the headbands, and the tablets, and the earrings, (Isaiah 3:20), where see the note (#486). The prophet wishes to allow the contrast between the time of mourning and that of rejoicing. The mourner sits with ashes on the head. See note on 2 Samuel 15:3232And it came to pass, that when David was come to the top of the mount, where he worshipped God, behold, Hushai the Archite came to meet him with his coat rent, and earth upon his head: (2 Samuel 15:32) (#279). When the mourning ceases and the joy comes the ashes are taken from the head, and, in the true spirit of rejoicing, a beautiful diadem is placed thereon instead.