comprehensive vs comprehend

comprehensive is a noun but comprehend is not a noun.

Word	Noun	Adjective	Verb	Adverb
comprehensive	Yes	Yes	No	No
comprehend	No	No	Yes	No

comprehensive (noun)	comprehend (noun)
an intensive examination testing a student's proficiency in some special field of knowledge

comprehensive (adjective)	comprehend (adjective)
including all or everything
broad in scope

comprehensive (verb)	comprehend (verb)
	get the meaning of something
	to become aware of through the senses
	include in scope; include as part of something broader; have as one's sphere or territory