Massachusetts vs Bay State

Massachusetts and Bay State both are nouns.

Word	Noun	Adjective	Verb	Adverb
Massachusetts	Yes	No	No	No
Bay State	Yes	No	No	No

As nouns, Massachusetts and Bay State are synonyms defined as:

Massachusetts and Bay State: a state in New England, with capital Boston; one of the original 13 colonies

Other synonyms of Massachusetts include MA, Mass., Old Colony.

Massachusetts (noun)	Bay State (noun)
the Algonquian language of the Massachuset	a state in New England, with capital Boston; one of the original 13 colonies
a state in New England, with capital Boston; one of the original 13 colonies
one of the British colonies that formed the United States, with capital Salem, Charlestown or Boston
a member of the Algonquian people who formerly lived around Massachusetts Bay