accessory, accompanying, associated, attendant, attending, changeable, coacting, coactive, coadjutant, coadjuvant, coefficient, coincident, collaborative, collateral, collective, collectivist, collectivistic, collusive, combined, commensal, common, communal, communalist, communalistic, communist, communistic, communitarian, commutable, commutative, commutual, complementary, concerted, concomitant, concordant, concurrent, concurring, conjoint, conjunct, connected, conniving, convertible, cooperant, cooperating, cooperative, correlative, coupled, ecumenic, equal, equalizing, equivalent, even, exchanged, fellow, general, give-and-take, harmonious, harmonized, in common, interactive, interchangeable, interchanged, joined, joint, noncompetitive, paired, parallel, permutable, popular, public, reciprocal, reciprocating, reciprocative, related, respective, retaliatory, returnable, shared, simultaneous, social, socialistic, societal, standard, swapped, switched, symbiotic, synergetic, synergic, synergistic, traded, transposed, twin, two-way, uncompetitive, united