step-up vs appreciation

step-up and appreciation both are nouns.

Word	Noun	Adjective	Verb	Adverb
step-up	Yes	No	No	No
appreciation	Yes	No	No	No

As nouns, appreciation is a hyponym of step-up; that is, appreciation is a word with a more specific, narrower meaning than step-up:

step-up (noun)	appreciation (noun)
the act of increasing something	a favorable judgment
	an increase in price or value
	understanding of the nature or meaning or quality or magnitude of something
	delicate discrimination (especially of esthetic values)
	an expression of gratitude