落下 (rakka, “to fall down”) + 傘 (san, “umbrella”)
落(らっ)下(か)傘(さん) • (rakkasan) ←らくかさん (rakukasan)?
落下傘 or 落下傘 or 落下傘 • (nakhasan or McCune-Reischauer: nakhasan or Yale: nak.hasan) (hangeul 낙하산)