assay-mark vs authentication

assay-mark and authentication both are nouns.

Word	Noun	Adjective	Verb	Adverb
assay-mark	Yes	No	No	No
authentication	Yes	No	No	No

As nouns, assay-mark and authentication are synonyms defined as:

assay-mark and authentication: a mark on an article of trade to indicate its origin and authenticity

Other synonyms of assay-mark include hallmark.

assay-mark (noun)	authentication (noun)
a mark on an article of trade to indicate its origin and authenticity	validating the authenticity of something or someone
	a mark on an article of trade to indicate its origin and authenticity