What
pronoun, interjection, の adjective
The kanji and the word are exactly the same. That means they share meanings as well.
なに, なん
The reading for this word is the same as the reading you learned with the kanji. What? Yeah, that's what.
何？
What?
ディナーは何がいい？
What do you want for dinner?
これは何の花ですか？
What flower is this?