marking vs hallmark

marking and hallmark both are nouns.

Word	Noun	Adjective	Verb	Adverb
marking	Yes	No	No	No
hallmark	Yes	No	No	No

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

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

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