southeasterly vs southeastern

southeasterly and southeastern both are adjectives.

Word	Noun	Adjective	Verb	Adverb
southeasterly	No	Yes	No	No
southeastern	No	Yes	No	No

As adjectives, southeasterly and southeastern are synonyms defined as:

southeasterly and southeastern: situated in or oriented toward the southeast

Other synonyms of southeasterly include southeast.

southeasterly (adjective)	southeastern (adjective)
situated in or oriented toward the southeast	of a region of the United States generally including Alabama; Georgia; Florida; Tennessee; South Carolina; North Carolina
coming from the southeast	situated in or oriented toward the southeast