earmark vs hallmark

earmark and hallmark both are nouns.

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

As nouns, earmark and hallmark are synonyms defined as:

earmark and hallmark: a distinctive characteristic or attribute of someone or something

Other synonyms of earmark include stylemark, trademark.

earmark (noun)	hallmark (noun)
a distinctive characteristic or attribute of someone or something	a distinctive characteristic or attribute of someone or something
identification mark on the ear of a domestic animal	a mark on an article of trade to indicate its origin and authenticity

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