northeastern vs northeasterly

northeastern and northeasterly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
northeastern	No	Yes	No	No
northeasterly	No	Yes	No	No

As adjectives, northeastern and northeasterly are synonyms defined as:

northeastern and northeasterly: situated in or oriented toward the northeast

Other synonyms of northeastern include northeast.

northeastern (adjective)	northeasterly (adjective)
of a region of the United States generally including the New England states, New York, and sometimes New Jersey and Pennsylvania	situated in or oriented toward the northeast
situated in or oriented toward the northeast	coming from the northeast