recitation vs brushup

recitation and brushup both are nouns.

Word	Noun	Adjective	Verb	Adverb
recitation	Yes	No	No	No
brushup	Yes	No	No	No

As nouns, brushup is a hyponym of recitation; that is, brushup is a word with a more specific, narrower meaning than recitation:

recitation (noun)	brushup (noun)
systematic training by multiple repetitions	practice intended to polish performance or refresh the memory
a regularly scheduled session as part of a course of study
a public instance of reciting or repeating (from memory) something prepared in advance
written matter that is recited from memory