S: (n) associate (a person who joins with others in some activity or endeavor) "he had to consult his associate before continuing"
S: (n) adjunct (a person who is an assistant or subordinate to another)
S: (n) affiliate (a subordinate or subsidiary associate; a person who is affiliated with another or with an organization)
S: (n) ally, friend (an associate who provides cooperation or assistance) "he's a good ally in fight"
S: (n) bedfellow (a temporary associate) "politics makes strange bedfellows"
S: (n) collaborator, cooperator, partner, pardner (an associate in an activity or endeavor or sphere of common interest) "the musician and the librettist were collaborators"; "sexual partners"
S: (n) colleague, confrere, fellow (a person who is member of one's class or profession) "the surgeon consulted his colleagues"; "he sent e-mail to his fellow hackers"
S: (n) member, fellow member (one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)) "only members will be admitted"; "a member of the faculty"; "she was introduced to all the members of his family"
S: (n) participant, player (someone who takes part in an activity) "he was a major player in setting up the corporation"
S: (n) adjunct (a construction that can be used to extend the meaning of a word or phrase but is not one of the main constituents of a sentence)
Adjective
S: (adj) accessory, adjunct, ancillary, adjuvant, appurtenant, auxiliary (furnishing added support) "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxiliary to each other"
S: (adj) adjunct, assistant (of or relating to a person who is subordinate to another)
W: (adj) dominant [Indirect via subordinate] (exercising influence or control) "television plays a dominant role in molding public opinion"; "the dominant partner in the marriage"