acanthosis nigricans vs keratosis nigricans

acanthosis nigricans and keratosis nigricans both are nouns.

Word	Noun	Adjective	Verb	Adverb
acanthosis nigricans	Yes	No	No	No
keratosis nigricans	Yes	No	No	No

As nouns, acanthosis nigricans and keratosis nigricans are synonyms defined as:

acanthosis nigricans and keratosis nigricans: a skin disease characterized by dark wartlike patches in the body folds; can be benign or malignant

acanthosis nigricans (noun)	keratosis nigricans (noun)
a skin disease characterized by dark wartlike patches in the body folds; can be benign or malignant	a skin disease characterized by dark wartlike patches in the body folds; can be benign or malignant