Vocabulary
키
height (of a person)
Meaning
키 : height (of a person). Noun for a person's physical stature.
Why this form?
높이 — “height” refers to spatial height or elevation; 키 is human stature.
Forms not to confuse
높이
벽의 높이를 재요. — I measure the wall's height.
Examples
내가 말한 건 키였어! — I meant his height!
키가 얼마나 커요? — How tall are you?