巣
す · su · JLPT N3 · noun
nest
🪺🐦 巣 = fruit (果) on a tree with three ticks on top: birds nesting in the tree
The older form 巢 shows three chicks (巛) above a nest sitting on a tree (木). The modern Japanese form simplifies the top to three short strokes. Sound hook: su is where the birds SUbside for the night, as in 巣箱 (subako, birdhouse).