interrogation vs interrogate

interrogation is a noun but interrogate is not a noun.

Word	Noun	Adjective	Verb	Adverb
interrogation	Yes	No	No	No
interrogate	No	No	Yes	No

interrogation (noun)	interrogate (noun)
formal systematic questioning
a sentence of inquiry that asks for a reply
an instance of questioning
a transmission that will trigger an answering transmission from a transponder

interrogation (verb)	interrogate (verb)
	pose a series of questions to
	transmit (a signal) for setting off an appropriate response, as in telecommunication