assay vs assayer

assay and assayer both are nouns.

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

assay (noun)	assayer (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 analyst who assays (performs chemical tests on) metals
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

assay (verb)	assayer (verb)
analyze (chemical substances)
make an effort or attempt