Sailor, Seaman
Noun
すいへい
あの水兵が、船長にふるえ声で何かを話しているのを見てしまったんだ。
I happened to see the seaman saying something to the captain in a shaky voice.
かわいい水兵服と水兵ぼうが売っていたので、まごに買ってあげました。
I found a cute sailor uniform and a sailor cap, so I bought them for my grandchild.
その演劇で水兵を演じた素晴らしい俳優は、観客を大いに沸かせた。
The brilliant actor who played a navy sailor in the play really wow’d the audience.
A water soldier is a soldier that is out to sea. In other words, a navy sailor.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.