Southern(a.) Of or pertaining to the south; situated in, or proceeding from, the south; situated or proceeding toward the south.
Southern(n.) A Southerner.
Southerner(n.) An inhabitant or native of the south, esp. of the Southern States of North America; opposed to Northerner.
Southernly(a.) Somewhat southern.
Southernly(adv.) In a southerly manner or course; southward.

Words within southerns