comrade

(noun) a friend who is frequently in the company of another. Synonyms: companion, fellow, familiar, associate. Examples: "Drinking companions." "Comrades in arms."

(noun) a fellow member of the Communist Party. Synonyms: Comrade.

(noun) used as a term of address for those male persons engaged in the same movement. Synonyms: brother. Example: "Greetings, comrade!."