compañero

1. companion (someone with whom one spends time or keeps company)
2. mate, colleague; (with a qualifier) fellow X, classmate, coworker, etc. (someone with whom something is shared)
3. fellow member of a political group; comrade
4. teammate (one who is on the same team)
5. mate, partner (matching item in a set)
6. partner, significant other (especially not a spouse)
7. companion (a thing or phenomenon that is closely associated with another thing, phenomenon, or person)
8. friendly term of address; friend, buddy