Cow and Cows

Cow noun - Female of domestic cattle: "`moo-cow' is a child's term".

Cows is a synonym for cow. In some cases you can use "Cows" instead a noun "Cow".

Cows noun - Domesticated bovine animals as a group regardless of sex or age.

Cow is a synonym for cows. Sometimes you can use "Cow" instead the word "Cows" as a noun or a verb.