comprehension vs apprehension

comprehension and apprehension both are nouns.

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

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

comprehension: an ability to understand the meaning or importance of something (or the knowledge acquired as a result)
apprehension: the cognitive condition of someone who understands

Other hypernyms of comprehension include discernment, savvy, understanding.

comprehension (noun)	apprehension (noun)
an ability to understand the meaning or importance of something (or the knowledge acquired as a result)	the act of apprehending (especially apprehending a criminal)
the relation of comprising something	the cognitive condition of someone who understands
	painful expectation
	fearful expectation or anticipation