is a specific kind of: act, move.

is a broader term that covers: collude, conspire | communicate, intercommunicate | reach out | condescend, patronise, patronize | communicate | control, keep in line, manipulate | transact | marginalise, marginalize | combine | have | invite, pay for | socialise, socialize | connect, get in touch, touch base | assemble, foregather, forgather, gather, meet | relate | do by, handle, treat | fall all over | interfere, interpose, intervene, step in | affiliate, associate, assort, consort | philander, womanise, womanize ... show more.

derivation: interaction | interactional, interactive.