set aside vs earmark

set aside is not a noun while earmark is a noun.

Word	Noun	Adjective	Verb	Adverb
set aside	No	No	Yes	No
earmark	Yes	No	Yes	No

As verbs, set aside and earmark are synonyms defined as:

set aside and earmark: give or assign a resource to a particular person or cause

Other synonyms of set aside include allow, appropriate, reserve.

set aside (noun)	earmark (noun)
	a distinctive characteristic or attribute of someone or something
	identification mark on the ear of a domestic animal

set aside (verb)	earmark (verb)
make inoperative or stop	give or assign a resource to a particular person or cause
give or assign a resource to a particular person or cause
annul (a legal decision)