northeasterly vs northeastern

northeasterly and northeastern both are adjectives.

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

As adjectives, northeasterly and northeastern are synonyms defined as:

northeasterly and northeastern: situated in or oriented toward the northeast

Other synonyms of northeasterly include northeast.

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