AB vs bachelor's degree

AB and bachelor's degree both are nouns.

Word	Noun	Adjective	Verb	Adverb
AB	Yes	No	No	No
bachelor's degree	Yes	No	No	No

As nouns, bachelor's degree is a hypernym of AB; that is, bachelor's degree is a word with a broader meaning than AB:

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

Other hypernyms of AB include baccalaureate.

AB (noun)	bachelor's degree (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