bookmarker vs bookmark

bookmarker and bookmark both are nouns.

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

As nouns, bookmarker and bookmark are synonyms defined as:

bookmarker and bookmark: a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place

bookmarker (noun)	bookmark (noun)
a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place	a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place