moustache vs toothbrush

moustache and toothbrush both are nouns.

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

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

Other hyponyms of moustache include soup-strainer, handle-bars, moustachio, mustachio, walrus moustache, walrus mustache.

moustache (noun)	toothbrush (noun)
an unshaved growth of hair on the upper lip	small brush; has long handle; used to clean teeth
	slang for a mustache