pustule vs hickey

pustule and hickey both are nouns.

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

As nouns, hickey is a hypernym of pustule; that is, hickey is a word with a broader meaning than pustule:

pustule: a small inflamed elevation of skin containing pus; a blister filled with pus
hickey: a small inflamed elevation of the skin; a pustule or papule; common symptom in acne

Other hypernyms of pustule include bleb, blister, bulla, pimple, zit.

pustule (noun)	hickey (noun)
a small inflamed elevation of skin containing pus; a blister filled with pus	a temporary red mark on a person's skin resulting from kissing or sucking by their lover
	a small inflamed elevation of the skin; a pustule or papule; common symptom in acne