eastern vs easterly

eastern is not a noun while easterly is a noun.

Word	Noun	Adjective	Verb	Adverb
eastern	No	Yes	No	No
easterly	Yes	Yes	No	Yes

As adjectives, eastern and easterly are synonyms defined as:

As adjectives, eastern and easterly are synonyms defined as:

eastern (noun)	easterly (noun)
	a wind from the east

eastern (adjective)	easterly (adjective)
relating to or characteristic of regions of eastern parts of the world	from the east; used especially of winds
of or characteristic of eastern regions of the United States	lying in or toward the east
lying toward or situated in the east
from the east; used especially of winds
lying in or toward the east

eastern (adverb)	easterly (adverb)
	from the east