marker vs bookmark

marker and bookmark both are nouns.

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

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

marker: some conspicuous object used to distinguish or mark something
bookmark: a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place

Other hyponyms of marker include bookmarker, yard marker.

marker (noun)	bookmark (noun)
some conspicuous object used to distinguish or mark something	a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place
a writing implement for making a mark
a distinguishing symbol