acne vulgaris vs acne

acne vulgaris and acne both are nouns.

Word	Noun	Adjective	Verb	Adverb
acne vulgaris	Yes	No	No	No
acne	Yes	No	No	No

As nouns, acne is a hypernym of acne vulgaris; that is, acne is a word with a broader meaning than acne vulgaris:

acne vulgaris: the most common form of acne; usually affects people from puberty to young adulthood
acne: an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones

acne vulgaris (noun)	acne (noun)
the most common form of acne; usually affects people from puberty to young adulthood	an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones