acne rosacea vs acne

acne rosacea and acne both are nouns.

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

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

acne rosacea: a skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearance
acne: an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones

acne rosacea (noun)	acne (noun)
a skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearance	an inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones