お先に

N2 先祖 senzo ancestor N2 先端 sentan pointed end, tip N2 先頭 sentou head, lead, vanguard N2 祖先 sosen ancestor(s) N2 真っ先 massaki foremost, beginning N3 先日 senjitsu the other day, a few days ago N3 先行 senkou preceding, going first N4 先輩 senpai senior, elder colleague N5 先生 sensei teacher

N5 先 sen / saki, ma.zu before, ahead, previous