What does this word mean?

3 comments

1. Context

   メイクアップ
   した セーラー
   せんしに,
   まちがいが

2. 戦士(せんし)に
   It’s not one word. 戦士 = warrior (I’m guessing you might be reading some Sailor Moon?) and に after a noun has several different possibilities

3. The word is 戦士 (せんし). The に is a particle.