moustache vs mustachio

moustache and mustachio both are nouns.

Word	Noun	Adjective	Verb	Adverb
moustache	Yes	No	No	No
mustachio	Yes	No	No	No

As nouns, mustachio is a hyponym of moustache; that is, mustachio is a word with a more specific, narrower meaning than moustache:

moustache: an unshaved growth of hair on the upper lip
mustachio: a large bushy moustache (with hair growing sometimes down the sides of the mouth)

moustache (noun)	mustachio (noun)
an unshaved growth of hair on the upper lip	a large bushy moustache (with hair growing sometimes down the sides of the mouth)