濠
ほり · hori · JLPT N3 · noun
moat
🏯🌊 氵 water + 豪 mighty = the mighty water ditch around a castle
The left side 氵 marks water, and 豪 (gō, powerful) also gives the on-reading ごう. A moat is a castle's powerful water defence. Verbal hook: hori sounds like horror, which is what invaders felt at the moat.