こうねつ【光熱】
light and heat光熱費expenses for lighting and fuel; electricity and heating expenses
こうねつ【口熱】
an inflammation of the gums
こうねつ【高熱】
1〔高い熱〕high heat高熱を出すemit high heat2〔体熱〕a high fever高熱を出したHe had [ran] a high fever [temperature]....
こうねつ【高熱】
a high fever [temperature]
こうねん【光年】
a light year太陽からその星までは4.3光年であるThat star is 4.3 light years away from the sun.