southwestern vs southwesterly

southwestern and southwesterly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
southwestern	No	Yes	No	No
southwesterly	No	Yes	No	No

As adjectives, southwestern and southwesterly are synonyms defined as:

southwestern and southwesterly: situated in or oriented toward the southwest

Other synonyms of southwestern include southwest.

southwestern (adjective)	southwesterly (adjective)
situated in or oriented toward the southwest	situated in or oriented toward the southwest
of a region of the United States generally including New Mexico, Arizona, Texas, California, and sometimes Nevada, Utah, Colorado	coming from the southwest