southerner, n. southron.
southern lights. aurora australis.
south wind. Auster, Notus.
souvenir, n. [keepsake], [reminder], [memento]; trophy.
sovereign, a. [supreme], [chief], paramount, [predominant]; controlling, [effectual], [efficacious].
sovereign, n. [ruler], [monarch].
sovereignty, n. [dominion], supremacy, [sway], [empire], [scepter], dynasty.
sow, v. propagate, disseminate, [scatter], [plant].
space, n. [extension], vacancy; vacuum; [distance], [interval]; interspace (intervening space); interstice; abyss. Associated words: plenum, plenist, vacuist, spacial.