IPA: /ˈskuːlˌtiːtʃər/
KK: /ˈskuːlˌtiːtʃər/
A person who educates students in a school, typically at the elementary or secondary level.
My sister is a schoolteacher who loves working with children.
Schoolteacher → It is formed from "school" (from Old English *scolu*, meaning a place of learning) and "teacher" (from Old English *tǣcan*, meaning to instruct or show). The word "schoolteacher" refers to a person who instructs or teaches in a place of learning.
Think of a 'place of learning' ('school') where someone 'instructs' ('teacher') others — that's what a schoolteacher does.
No commonly confused words.