KEY: Companion.
SYN: Associate, mate, comrade, colleague, ally, partner, accomplice, coadjutor.
ANT: Rival, toe, antagonist, adversary.
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KEY: Companionable.
SYN: Pleasant, affable, sociable, convertible, friendly, easy, agreeable, gregarious.
ANT: Disagreeable, churlish, unsociable, distant, reserved, ungenial, cold, inaccessible, unneighborly, solitary.
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KEY: Companionship.
SYN: Converse, acquaintance, familiarity, intimacy, friendliness, association.