perseveration vs perseverate

perseveration is a noun but perseverate is not a noun.

Word	Noun	Adjective	Verb	Adverb
perseveration	Yes	No	No	No
perseverate	No	No	Yes	No

perseveration (noun)	perseverate (noun)
the act of persisting or persevering; continuing or repeating behavior
the tendency for a memory or idea to persist or recur without any apparent stimulus for it

perseveration (verb)	perseverate (verb)
	repeat a response after the cessation of the original stimulus