inter

interplay, interact, interaction, interjection, internet, interconnect, interlink, interface, interrelate, interlock, intermix, intersperse, intersect, intertwine, interweave, interleave, intermingle, interchange, interoperate, interdependent, interfaith, intercultural, intergroup, intercompany, intercommunity, interstate, international, interpersonal, interspace, interstellar, intermediary, intervene, interfere, interrupt, intercept, intercede, interim, intermediate, intermission, intermittent, interlude, interval, interview, interpret, intercourse, intercom, interfile, interdict

* The prefix inter- usually means "between" or "among".