earring vs earcuff

earring and earcuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
earring	Yes	No	No	No
earcuff	Yes	No	No	No

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

earring: jewelry to ornament the ear; usually clipped to the earlobe or fastened through a hole in the lobe
earcuff: a non-pierced earring of varying size (i.e. small wrap or hook big enough to hang over the whole ear and dangle) worn on the rim of the ear.

Other hyponyms of earring include drop earring, eardrop, pendant earring, ear cuff, ear hook earring, ear wrap.

earring (noun)	earcuff (noun)
jewelry to ornament the ear; usually clipped to the earlobe or fastened through a hole in the lobe	a non-pierced earring of varying size (i.e. small wrap or hook big enough to hang over the whole ear and dangle) worn on the rim of the ear.