先 （セン） former, previous, old, first move (in go, shogi, etc.), opening move

先駆 （センク） forerunner, precursor, pioneer, leader, outrider, outriding

機先 （キセン） forestall

互先 （タガイセン） even game (esp. in go)

先 （さき） point, tip, end, nozzle, head (of a line), front, first, before, ahead (of), (the way) ahead, beyond, future, previous, prior, former, recent, last, destination, address, place where you do something, rest (e.g. of a story), continuation, remaining part, the other party

先行き （さきゆき） the future, future prospects

小手先 （こてさき） tip of the hand, (use of) one's hands, cheap trick, superficial wit, superficial cleverness, cheap, makeshift (e.g. measures), shortsighted, perfunctory, halfhearted

矛先 （ほこさき） point of a spear, spearhead, focus (of one's attack, criticism, etc.), aim, target, brunt, force (of an argument), edge

先ず （まず） first (of all), firstly, to begin with, before anything else, probably, most likely, almost certainly, virtually, more or less (satisfactory), on the whole, reasonably, anyway, at any rate, for now (at least), for the time being

まず第一に （まずだいいちに） first of all, in the first place, to begin with, for starters