sponge, v. imbibe, [absorb]; expunge, [efface], [erase], [obliterate].
sponger, n. [parasite], [hanger-on], trencher [friend].
spongy, a. [porous], spongoid, spongiform, incompact; [absorbent], [bibulous].
sponsor, n. godparent; [surety]. Associated words: sponsorial, sponsorship, sponsion, [ward], protégé.
spontaneous, a. instinctive, [voluntary], [impulsive], unforced
spontaneous generation. abiogenesis.
spook, n. [ghost], [spirit], [specter], [apparition], [phantom], [hobgoblin].
spooney, a. (Colloq.) [silly], [sentimental], foolishly [fond].
spoor, n. [track], trail (of a wild animal).
sporadic, a. [separate], [single], [isolated].