ESP, access, accord, agency, agree, agree with, aisle, alley, alternate, alternation, ambulatory, answer, aperture, arcade, artery, avenue, bandy, barter, bartering, be in connection, be in contact, be quits with, boomerang, brokerage, buy and sell, buying and selling, change, channel, chime in with, cloister, coact, coaction, colonnade, comeback, commerce, commerce with, commune with, communicate, communication, communion, commute, compensate, complementary distribution, concurrence, conduction, conduit, congress, connection, contact, contagion, convection, conversation, converse, cooperate, cooperation, correspond, correspondence, corridor, cotton to, counter, counterblast, counterblow, counterchange, counterstroke, covered way, deal, deal with, dealing, dealings, defile, delivery, deportation, diapedesis, diffusion, dissemination, do business, doing business, dovetail, empathize, engage, engagement, exchange, exit, export, exportation, expulsion, extradition, fall in with, ferry, ford, gallery, get along, get along with, get back at, get even with, get on with, give-and-take, give and take, give in exchange, handy, harmonize, harmonize with, have dealings with, have intercourse, have truck with, hold communication, horse-trade, horse trading, identify with, import, importation, information, inlet, interact, interaction, intercommunicate, intercommunication, intercommunion, intercourse, interlace, interlacing, intermesh, intermeshing, interplay, intersection, intertwine, intertwining, interweave, interweaving, interwork, interworking, jobbing, junction, lane, linguistic intercourse, logroll, merchandising, mesh, meshing, message, metastasis, metathesis, metempsychosis, migration, mortise, mutual transfer, opening, osmosis, outlet, overpass, pass, passage, passageway, passing over, pay back, perfusion, permute, portico, quid pro quo, railroad tunnel, reciprocate, reciprocation, recoil, reply, requite, respond, respond to, response, retailing, retaliate, retaliation, retort, return, return the compliment, reverse, seesaw, sing in chorus, social intercourse, speak, speaking, speech, speech circuit, speech situation, spread, spreading, swap, swap horses, swapping, switch, sympathize, take in exchange, talk, talking, telepathy, tit for tat, touch, trade, trade in, trade off, trade sight unseen, trading, traffic, traffic with, trafficking, traject, trajet, transduction, transfer, transfer of property, transference, transfusion, transit, transition, translation, translocation, transmigration, transmigration of souls, transmission, transmittal, transmittance, transplacement, transplantation, transposal, transpose, transposition, travel, truck, tunnel, two-way communication, underpass, understand one another, wheeling and dealing, wholesaling