grass widow vs divorcee

grass widow and divorcee both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass widow	Yes	No	No	No
divorcee	Yes	No	No	No

As nouns, grass widow and divorcee are synonyms defined as:

grass widow and divorcee: a divorced woman or a woman who is separated from her husband

grass widow (noun)	divorcee (noun)
a divorced woman or a woman who is separated from her husband	a divorced woman or a woman who is separated from her husband