esti (Greek #2076)
he (she or it) is; also (with neuter plural) they are
KJV usage: are, be(-long), call, X can(-not), come, consisteth, X dure for a while, + follow, X have, (that) is (to say), make, meaneth, X must needs, + profit, + remaineth, + wrestle.
Pronounce: es-tee'
Origin: third person singular present indicative of 1510
dei (Greek #1163)
also δέον (deh-on'); neuter active participle of the same; both used impersonally; it is (was, etc.) necessary (as binding)
KJV usage: behoved, be meet, must (needs), (be) need(-ful), ought, should.
Pronounce: die
Origin: 3d person singular active present of 1210