mourning band vs weed

mourning band and weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
mourning band	Yes	No	No	No
weed	Yes	No	Yes	No

As nouns, mourning band and weed are synonyms defined as:

mourning band and weed: a black band worn by a man (on the arm or hat) as a sign of mourning

mourning band (noun)	weed (noun)
a black band worn by a man (on the arm or hat) as a sign of mourning	street names for marijuana
	a black band worn by a man (on the arm or hat) as a sign of mourning
	any plant that crowds out cultivated plants

mourning band (verb)	weed (verb)
	clear of weeds