marking vs assay-mark

marking and assay-mark both are nouns.

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

As nouns, assay-mark is a hyponym of marking; that is, assay-mark is a word with a more specific, narrower meaning than marking:

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

marking (noun)	assay-mark (noun)
evaluation of performance by assigning a grade or score	a mark on an article of trade to indicate its origin and authenticity
the act of making a visible mark on a surface
a pattern of marks
a distinguishing symbol