hallmark vs marker

hallmark and marker both are nouns.

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

As nouns, marker is a hypernym of hallmark; that is, marker is a word with a broader meaning than hallmark:

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

Other hypernyms of hallmark include mark, marking.

hallmark (noun)	marker (noun)
a distinctive characteristic or attribute of someone or something	some conspicuous object used to distinguish or mark something
a mark on an article of trade to indicate its origin and authenticity	a writing implement for making a mark
	a distinguishing symbol