widowman vs widower

widowman and widower both are nouns.

Word	Noun	Adjective	Verb	Adverb
widowman	Yes	No	No	No
widower	Yes	No	No	No

As nouns, widowman and widower are synonyms defined as:

widowman and widower: a man whose wife is dead especially one who has not remarried

widowman (noun)	widower (noun)
a man whose wife is dead especially one who has not remarried	a man whose wife is dead especially one who has not remarried