Fever
Heat
noun
The kanji and the word are exactly the same. That means they share meanings as well.
The reading is the same as the one you learned with the kanji, so don't get all feverish over this one.
今日は少し熱があるので外出できません。
I have a bit of a fever today so I can’t go out.
ちょっと熱っぽいし、ダルいんだよね。
I'm a little feverish and sluggish.
え、やば。熱、40度もあるじゃん。
Oh no, I have a forty degree fever?