head teacher vs educator

head teacher and educator both are nouns.

Word	Noun	Adjective	Verb	Adverb
head teacher	Yes	No	No	No
educator	Yes	No	No	No

As nouns, educator is a hypernym of head teacher; that is, educator is a word with a broader meaning than head teacher:

Other hypernyms of head teacher include pedagog, pedagogue.

head teacher (noun)	educator (noun)
the educator who has executive authority for a school	someone who educates young people