THESAURUS
Coact
accord, act in concert, act together, affiliate, agree, ally, amalgamate, associate, band, band together, be in cahoots, be in league, club together, coadunate, coalesce, coincide, collaborate, collude, combine, concert, concord, concur, confederate, conjoin, connive, consolidate, conspire, cooperate, correspond, do business with, dovetail, engage, federate, fuse, get heads together, get together, go partners, hang together, happen together, harmonize, hold together, hook up, interact, interchange, interlace, intermesh, interplay, intertwine, interweave, interwork, join, join in, join together, keep together, league, league together, make common cause, merge, mesh, mortise, partner, play ball, pull together, put heads together, reciprocate, stand together, synchronize, synergize, team up, throw in together, tie in, tie up, unite, unite efforts, work together
ROGET THESAURUS
Coact
Cooperation
VB
cooperate, concur, coact, synergize, conduce, combine, unite one's efforts, keep together, draw together, pull together, club together, hand together, hold together, league together, band together, be banded together, pool, stand shoulder to shoulder, put shoulder to shoulder, act in concert, join forces, fraternize, cling to one another, conspire, concert, lay one's heads together, confederate, be in league with, collude, understand one another, play into the hands of, hunt in couples, side with, take side with, go along with, go hand in hand with, join hands with, make common cause with, strike in with, unite with, join with, mix oneself up with, take part with, cast in one's lot with, join partnership, enter into partnership with, rally round, follow the lead of, come to, pass over to, come into the views of, be in the same boat, row in the same boat, sail in the same boat, sail on the same tack, be a party to, lend oneself to, chip in, participate, have a hand in, have a finger in the pie, take part in, bear part in, second, take the part of, play the game of, espouse a cause, espouse a quarrel.