Head
noun
The kanji and the word are exactly the same. That means they share meanings as well.
あたま
Since this word is made up of a single kanji, it should use the kun'yomi reading which you learned with the kanji earlier. No problem!
頭に何か糸のような物が付いてますよ。
You have something like a thread on your head.
このアパートは高さがあまりないので、頭の上に気をつけてください。
This apartment isn't that tall, so watch your head, please.
「頭がいい人」というのは、一体、どういう人の事ですか?
What kind of person is a "smart person"?