deary vs teacher's pet

deary and teacher's pet both are nouns.

Word	Noun	Adjective	Verb	Adverb
deary	Yes	No	No	No
teacher's pet	Yes	No	No	No

As nouns, teacher's pet is a hyponym of deary; that is, teacher's pet is a word with a more specific, narrower meaning than deary:

Other hyponyms of deary include chosen, macushla, mollycoddle.

deary (noun)	teacher's pet (noun)
a special loved one	the teacher's favorite student
a beloved person; used as terms of endearment