What
pronoun, interjection, の adjective
The kanji and the word are exactly the same. That means they share meanings as well.
The reading for this word is the same as the reading you learned with the kanji. What? Yeah, that's what.
Heads up: The primary reading for 何 is なに, but it gets read as なん in certain situations. You'll eventually get the hang of which reading to use when as you encounter this word more, so don't worry about it too much and just keep learning!
何がある
What is there?
何がおいしい
What tastes good?
何がほしい
What do you want?
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?