chancellor vs head teacher

chancellor and head teacher both are nouns.

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

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

Other hypernyms of chancellor include head, principal, school principal.

chancellor (noun)	head teacher (noun)
the person who is head of government (in several countries)	the educator who has executive authority for a school
the honorary or titular head of a university