assay-mark vs hallmark

assay-mark and hallmark both are nouns.

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

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

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

Other synonyms of assay-mark include authentication.

assay-mark (noun)	hallmark (noun)
a mark on an article of trade to indicate its origin and authenticity	a distinctive characteristic or attribute of someone or something
	a mark on an article of trade to indicate its origin and authenticity