楽器
がっき · gakki · JLPT N3 · noun
musical instrument
🎸🎹 楽器 = music/fun + vessel: a tool for making music
楽 (gaku) means music, as in 音楽 ongaku, and 器 (ki) means vessel or tool, as in 食器 shokki, tableware. Put together, the two readings fuse into gakki: the tool for music.