appreciation vs apprehension

appreciation and apprehension both are nouns.

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

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

appreciation: understanding of the nature or meaning or quality or magnitude of something
apprehension: the cognitive condition of someone who understands

Other hypernyms of appreciation include discernment, savvy, understanding.

appreciation (noun)	apprehension (noun)
a favorable judgment	the act of apprehending (especially apprehending a criminal)
an increase in price or value	the cognitive condition of someone who understands
understanding of the nature or meaning or quality or magnitude of something	painful expectation
delicate discrimination (especially of esthetic values)	fearful expectation or anticipation
an expression of gratitude