grasping vs apprehension

grasping and apprehension both are nouns.

Word	Noun	Adjective	Verb	Adverb
grasping	Yes	Yes	No	No
apprehension	Yes	No	No	No

As nouns, apprehension is a hypernym of grasping; that is, apprehension is a word with a broader meaning than grasping:

Other hypernyms of grasping include discernment, savvy, understanding.

grasping (noun)	apprehension (noun)
the act of gripping something firmly with the hands (or the tentacles)	the act of apprehending (especially apprehending a criminal)
understanding with difficulty	the cognitive condition of someone who understands
	painful expectation
	fearful expectation or anticipation

grasping (adjective)	apprehension (adjective)
immoderately desirous of acquiring e.g. wealth