succeed vs assay

succeed is not a noun while assay is a noun.

Word	Noun	Adjective	Verb	Adverb
succeed	No	No	Yes	No
assay	Yes	No	Yes	No

succeed (noun)	assay (noun)
	a quantitative or qualitative test of a substance (especially an ore or a drug) to determine its components; frequently used to test for the presence or concentration of infectious agents or antibodies etc.
	an appraisal of the state of affairs
	a written report of the results of an analysis of the composition of some substance
	a substance that is undergoing an analysis of its components

succeed (verb)	assay (verb)
attain success or reach a desired goal	analyze (chemical substances)
be the successor (of)	make an effort or attempt