AB vs baccalaureate

AB and baccalaureate both are nouns.

Word	Noun	Adjective	Verb	Adverb
AB	Yes	No	No	No
baccalaureate	Yes	No	No	No

As nouns, baccalaureate is a hypernym of AB; that is, baccalaureate is a word with a broader meaning than AB:

AB: a bachelor's degree in arts and sciences
baccalaureate: an academic degree conferred on someone who has successfully completed undergraduate studies

Other hypernyms of AB include bachelor's degree.

AB (noun)	baccalaureate (noun)
the blood group whose red cells carry both the A and B antigens	an academic degree conferred on someone who has successfully completed undergraduate studies
a bachelor's degree in arts and sciences	a farewell sermon to a graduating class at their commencement ceremonies