ear cuff vs earring

ear cuff and earring both are nouns.

Word	Noun	Adjective	Verb	Adverb
ear cuff	Yes	No	No	No
earring	Yes	No	No	No

As nouns, earring is a hypernym of ear cuff; that is, earring is a word with a broader meaning than ear cuff:

ear cuff: 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.
earring: jewelry to ornament the ear; usually clipped to the earlobe or fastened through a hole in the lobe

ear cuff (noun)	earring (noun)
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.	jewelry to ornament the ear; usually clipped to the earlobe or fastened through a hole in the lobe