Noun
あたま
頭をあらってあげましょう。
I’ll wash your head.
ひるねをすると、いつも頭がすっきりします。
Taking a nap usually refreshes my mind.
頭が痛いので、喋らないでください。
I have a headache so please stop talking.
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!