divorced man vs grass widower

divorced man and grass widower both are nouns.

Word	Noun	Adjective	Verb	Adverb
divorced man	Yes	No	No	No
grass widower	Yes	No	No	No

As nouns, divorced man and grass widower are synonyms defined as:

divorced man and grass widower: a man who is divorced from (or separated from) his wife

divorced man (noun)	grass widower (noun)
a man who is divorced from (or separated from) his wife	a man who is divorced from (or separated from) his wife