authentication vs marker

authentication and marker both are nouns.

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

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

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

Other hypernyms of authentication include mark, marking.

authentication (noun)	marker (noun)
validating the authenticity of something or someone	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