What do you call a group of cows? You could go with “herd,” or you could use the older term “kine.” This almost-forgotten word stems from the Middle English “kye,” meaning “cows.” “Kine” holds the distinction of being the only plural noun in the English language that shares no letters with its singular form, “cow.” Of course, English has lots of irregular singular-plural noun pairings, such as “mouse”/”mice” and “foot”/”feet.”