marking vs earmark

marking and earmark both are nouns.

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

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

marking (noun)	earmark (noun)
evaluation of performance by assigning a grade or score	a distinctive characteristic or attribute of someone or something
the act of making a visible mark on a surface	identification mark on the ear of a domestic animal
a pattern of marks
a distinguishing symbol

marking (verb)	earmark (verb)
	give or assign a resource to a particular person or cause