cow vs cows

cow and cows both are nouns.

Word	Noun	Adjective	Verb	Adverb
cow	Yes	No	Yes	No
cows	Yes	No	No	No

As nouns, cows is a hypernym of cow; that is, cows is a word with a broader meaning than cow:

Other hypernyms of cow include Bos taurus, cattle, kine, oxen.

cow (noun)	cows (noun)
female of domestic cattle:	domesticated bovine animals as a group regardless of sex or age
mature female of mammals of which the male is called `bull'
a large unpleasant woman

cow (verb)	cows (verb)
subdue, restrain, or overcome by affecting with a feeling of awe; frighten (as with threats)