compeer \kuhm-PEER, noun:

1. Close friend; comrade.
2. An equal in rank, ability, accomplishment, etc.; peer; colleague.

verb:
1. Archaic. To be the equal of; match.

Whoever eats them outlasts heaven and earth, and is the compeer of sun and moon.
— Cheng’en Wu, Monkey

Aren’t you pleased with him, and didn’t he arrange things well, eh, my good compeer Lenet?
— Alexandre Dumas, The Women’s War

Compeer comes from the Latin word parem which meant “equal.” The prefix com- means “with, together or in association.”