acid test vs assessment

acid test and assessment both are nouns.

Word	Noun	Adjective	Verb	Adverb
acid test	Yes	No	No	No
assessment	Yes	No	No	No

As nouns, assessment is a hypernym of acid test; that is, assessment is a word with a broader meaning than acid test:

acid test: a rigorous or crucial appraisal
assessment: the classification of someone or something with respect to its worth

Other hypernyms of acid test include appraisal.

acid test (noun)	assessment (noun)
a rigorous or crucial appraisal	the act of judging or assessing a person or situation or event
	the market value set on assets
	the classification of someone or something with respect to its worth
	an amount determined as payable