brussels sprout vs brussels sprouts

brussels sprout and brussels sprouts both are nouns.

Word	Noun	Adjective	Verb	Adverb
brussels sprout	Yes	No	No	No
brussels sprouts	Yes	No	No	No

brussels sprout (noun)	brussels sprouts (noun)
plant grown for its stout stalks of edible small green heads resembling diminutive cabbages	the small edible cabbage-like buds growing along a stalk of the brussels sprout plant