widow's weeds vs weeds

widow's weeds and weeds both are nouns.

Word	Noun	Adjective	Verb	Adverb
widow's weeds	Yes	No	No	No
weeds	Yes	No	No	No

As nouns, widow's weeds and weeds are synonyms defined as:

widow's weeds and weeds: a black garment (dress) worn by a widow as a sign of mourning

widow's weeds (noun)	weeds (noun)
a black garment (dress) worn by a widow as a sign of mourning	a black garment (dress) worn by a widow as a sign of mourning