underevaluation vs appraisal

underevaluation and appraisal both are nouns.

Word	Noun	Adjective	Verb	Adverb
underevaluation	Yes	No	No	No
appraisal	Yes	No	No	No

As nouns, appraisal is a hypernym of underevaluation; that is, appraisal is a word with a broader meaning than underevaluation:

underevaluation: an appraisal that underestimates the value of something
appraisal: the classification of someone or something with respect to its worth

Other hypernyms of underevaluation include assessment.

underevaluation (noun)	appraisal (noun)
an appraisal that underestimates the value of something	an expert estimation of the quality, quantity, and other characteristics of someone or something
	the classification of someone or something with respect to its worth
	a document appraising the value of something (as for insurance or taxation)