hickey vs papule

hickey and papule both are nouns.

Word	Noun	Adjective	Verb	Adverb
hickey	Yes	No	No	No
papule	Yes	No	No	No

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

hickey: a small inflamed elevation of the skin; a pustule or papule; common symptom in acne
papule: a small inflamed elevation of skin that is nonsuppurative (as in chicken pox)

Other hyponyms of hickey include pustule.

hickey (noun)	papule (noun)
a temporary red mark on a person's skin resulting from kissing or sucking by their lover	a small inflamed elevation of skin that is nonsuppurative (as in chicken pox)
a small inflamed elevation of the skin; a pustule or papule; common symptom in acne