marker vs marking

marker and marking both are nouns.

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

As nouns, marker and marking are synonyms defined as:

Other synonyms of marker include mark.

marker (noun)	marking (noun)
some conspicuous object used to distinguish or mark something	evaluation of performance by assigning a grade or score
a writing implement for making a mark	the act of making a visible mark on a surface
a distinguishing symbol	a pattern of marks
	a distinguishing symbol