widow vs widow woman

widow and widow woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
widow	Yes	No	Yes	No
widow woman	Yes	No	No	No

As nouns, widow and widow woman are synonyms defined as:

widow and widow woman: a woman whose husband is dead especially one who has not remarried

widow (noun)	widow woman (noun)
a woman whose husband is dead especially one who has not remarried	a woman whose husband is dead especially one who has not remarried

widow (verb)	widow woman (verb)
cause to be without a spouse