熱湯
ねっとう · nettou · JLPT N1 · noun
water
🫖 熱 (netsu) = heat + 湯 (yu) = hot water, so 熱湯 = boiling water
Both kanji carry the idea of hot, so the compound doubles it up: heat plus hot water makes boiling water. The reading shifts to nettou in this word.