Strong’s Greek
G81 — adelphotes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀδελφότης
adelphotes — pronounced ad-el-fot'-ace
from 80; brotherhood (properly, the feeling of brotherliness), i.e. the (Christian) fraternity:--brethren, brotherhood. see GREEK for 80
2 occurrences in the KJV.
1 Peter 2:17
Honour all men. Love the brotherhood. Fear God. Honour the king.
1 Peter 5:9
Whom resist stedfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.