Green Mountain State vs Vermont

Green Mountain State and Vermont both are nouns.

Word	Noun	Adjective	Verb	Adverb
Green Mountain State	Yes	No	No	No
Vermont	Yes	No	No	No

As nouns, Green Mountain State and Vermont are synonyms defined as:

Green Mountain State and Vermont: a state in New England with capital Montpelier

Other synonyms of Green Mountain State include Vt., VT.

Green Mountain State (noun)	Vermont (noun)
a state in New England with capital Montpelier	a state in New England with capital Montpelier