Head
noun
The kanji and the word are exactly the same. That means they share meanings as well.
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!
頭がいい
to be intelligent
頭が下がる
to be greatly impressed, to take one's hat off to
頭がくらくらする
to feel light in the head, to feel dizzy
頭に入る
to get into one's head
頭にのせる
to put on one's head
頭に入れる
to put into one's head, to keep in mind
頭をかかえる
to be at a wit's end
頭をなでる
to rub one's head
頭を下げる
to lower one's head, to bow
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"?