grasp vs comprehend

grasp is a noun but comprehend is not a noun.

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

As verbs, grasp and comprehend are synonyms defined as:

Other synonyms of grasp include apprehend, compass, dig, get the picture, grok, savvy.

grasp (noun)	comprehend (noun)
the act of grasping
an intellectual hold or understanding
understanding of the nature or meaning or quality or magnitude of something
the limit of capability

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