pimple vs papule

pimple and papule both are nouns.

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

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

pimple: 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 pimple include pustule.

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