scurrilous

As a verb denigrate

is to criticise so as to besmirch; traduce, disparage or defame.

As an adjective scurrilous is

given to vulgar verbal abuse; foul-mouthed.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective scurrilous is

(of a person) given to vulgar verbal abuse; foul-mouthed.

As an adjective scurrilous is

(of a person) given to vulgar verbal abuse; foul-mouthed.

As adjectives the difference between ribald and scurrilous

is that ribald is coarsely, vulgarly, or lewdly amusing; referring to sexual matters in a rude or irreverent way while scurrilous is (of a person) given to vulgar verbal abuse; foul-mouthed.

As a noun ribald

is an individual who is filthy or vulgar in nature.

As adjectives the difference between scurrilous and fescennine

is that scurrilous is (of a person) given to vulgar verbal abuse; foul-mouthed while fescennine is of or pertaining to the ancient etruscan town of fescennia.