Zelotes

Boyd’s Bible Dictionary:

(zealous). A name added to that of the apostle Simon to distinguish him from Simon Peter, and to emphasize his membership of the party of Zealots (Luke 6:1515Matthew and Thomas, James the son of Alpheus, and Simon called Zelotes, (Luke 6:15)). [SIMON, 4.]

Concise Bible Dictionary:

See SIMON No. 2.

Strong’s Dictionary of Greek Words:

Number:
2207 (find all occurrences in KJV Bible)
Greek:
ζηλωτής
Transliteration:
zelotes
Phonic:
dzay-lo-tace’
Meaning:
from 2206; a "zealot"
KJV Usage:
zealous