[せん, sen] (adj-no, n) (1) former; previous; old; (n) (2) first move (in go, shogi, etc.); opening move #620
[さき, saki] (n, adj-no, n-suf, pref) (1) previous; prior; former; some time ago; preceding; (2) point (e.g. pencil); tip; end; nozzle; (3) head (of a line); front; (4) ahead; the other side; (5) the future; hereafter; (6) destination; (7) the other party; (P) #620
[せんせい, sensei] (n) (1) teacher; master; doctor; (suf) (2) with names of teachers, etc. as an honorific; (P) #1811
[せんだい, sendai] (n) family predecessor; previous age; previous generation; (P) #3280
[せんぱつ, senpatsu] (n, vs, adj-no) (1) forerunner; advance party; going on ahead; (2) being in a (team sports) match or game from the start; starting; (P) #3391
[せんこう, senkou] (n, vs, adj-no) preceding; going first; leading; going ahead; taking priority; (P) #3410
[せんぱい, senpai] (n) (See 後輩・こうはい) senior (at work or school); superior; elder; older graduate; progenitor; old-timer; (P) #4217
[せんたん, sentan] (n, adj-no) pointed end; tip; fine point; spearhead; cusp; vanguard; advanced; leading edge; apex (of a curve); (P) #5599
[せんとう, sentou] (n) head; lead; vanguard; first; (P) #5617
[せんじゅうみん, senjuumin] (n, adj-no) former inhabitant; indigenous people; aborigines #9029