accompaniment, accord, accordance, advocacy, affiliation, affinity, agreement, aid, alliance, alternation, assent, assistance, association, auspices, backing, backup, battledore and shuttlecock, blessing, cahoots, chorus, co-working, coaction, coherence, coincidence, collaboration, collective farm, collectivism, collectivity, collegiality, collusion, combination, combined effort, common ownership, communal effort, communion, communism, community, commutation, companionship, company, compatibility, complementary distribution, concert, concerted action, concomitance, concord, concordance, concourse, concurrence, confluence, conformance, conformation, conformity, congeniality, congruence, congruency, congruity, conjunction, consilience, consistency, consociation, consonance, consort, conspiracy, cooperative society, correspondence, counterchange, cross fire, democracy, engagement, equivalence, exchange, favor, fellowship, fraternity, fraternization, friendship, give-and-take, harmony, help, helping hand, interaction, interchange, intercommunication, intercourse, interlacing, intermeshing, intermutation, interplay, intersection, intertwining, interweaving, interworking, junction, kibbutz, kolkhoz, lex talionis, measure for measure, membership, mesh, meshing, mutual admiration, mutual support, mutual transfer, mutuality, oneness, overlap, parallelism, parasitism, partaking, participation, patronage, peace, permutation, profit sharing, public ownership, quid pro quo, rapport, reciprocality, reciprocation, reciprocity, retaliation, saprophytism, seesaw, self-consistency, sharecropping, sharing, simultaneity, socialism, society, something for something, sponsorship, state ownership, support, symbiosis, symmetry, sync, synchronism, synergism, synergy, tally, teamwork, timing, tit for tat, town meeting, transposal, transposition, uniformity, union, unison, unisonance, united action