“head” in Japanese is 頭, read tou, zu, atama (とう, ず, あたま, かしら). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 頭脳 (brains/intellect).
What does 頭 mean?
頭がすこし痛い。
Same sound, different character — the classic trap. Compare them side by side: