ace
adjunct
aide
ally
amigo
assistant
associate
bedfellow
bedmate
bosom buddy
brother
brother-in-arms
buddy
bunkie
bunkmate
butty
camarade
centumvir
chamberfellow
chum
classmate
co-worker
coadjutor
cohort
comate
companion
company
compatriot
compeer
comrade
confederate
confrere
consociate
consort
copartner
coworker
crony
duumvir
fellow
fellow member
fellow student
girl friend
gossip
collegial
collegiate
adviser
correspondent
follower
journalist
lawyer
minister
neighbors
partner
physician
professor
representative
researcher
scientist
secretary
statesman