moo-cow vs cow

moo-cow and cow both are nouns.

Word	Noun	Adjective	Verb	Adverb
moo-cow	Yes	No	No	No
cow	Yes	No	Yes	No

As nouns, moo-cow and cow are synonyms defined as:

moo-cow (noun)	cow (noun)
female of domestic cattle:	female of domestic cattle:
	mature female of mammals of which the male is called `bull'
	a large unpleasant woman

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