| Word | Reading | Meaning | Level |
|---|
| 熱い | あつい | hot - liquid/objects | N5 |
| 熱々 | あつあつ | piping hot | N4 |
| 熱演 | ねつえん | passionate performance | N4 |
| 高熱 | こうねつ | high heat, intense temperature | N3 |
| 摩擦熱 | まさつねつ | frictional heat | N3 |
| 伝熱 | でんねつ | heat transfer | N3 |
| 過熱 | かねつ | overheating | N3 |
| 耐熱 | たいねつ | heat resistance | N3 |
| 余熱 | よねつ | residual heat | N3 |
| 熱気 | ねっき | enthusiasm, excitement | N3 |
| 加熱 | かねつ | heating | N3 |
| 放熱 | ほうねつ | heat dissipation | N2 |
| 輻射熱 | ふくしゃねつ | radiant thermal heat | N1 |
| 蓄熱 | ちくねつ | long-term thermal retention | N1 |
| 発熱 | はつねつ | biological heat generation of fungal metabolism | N1 |
| 熱放散 | ねつほうさん | dissipation of excess metabolic heat | N1 |
| 粗熱 | あらねつ | initial scalding residual heat | N1 |
| 発酵熱 | はっこうねつ | internal metabolic heat of fermentation | N1 |
| 非加熱 | ひかねつ | unheated, raw, living enzyme state | N1 |
| 耐熱性 | たいねつせい | heat-defying thermal resistance | N1 |
| 熱膨張 | ねつぼうちょう | thermal expansion coefficient | N1 |
| 蓄熱性 | ちくねつせい | prolonged heat-storage capacity | N1 |
| 熱衝撃 | ねつしょうげき | sudden severe thermal shock | N1 |
| 予熱 | よねつ | gentle pre-warming of vessels prior to hot service | N1 |
