pillory (n.) Look up pillory at Dictionary.com
1274 (attested in Anglo-L. from c.1189), from O.Fr. pellori (1168), from M.L. pilloria, of uncertain origin, perhaps a dim of L. pila "pillar, stone barrier." The verb is first attested 1600.
stock (n.1) Look up stock at Dictionary.com
O.E. stocc "stump, post, stake, tree trunk, log," also "pillory" (usually plural, stocks), from P.Gmc. *stukkaz "tree trunk" (cf. O.N. stokkr "block of wood, trunk of a tree," O.S., O.Fris. stok, M.Du. stoc "tree trunk, stump," Du. stok "stick, cane," O.H.G. stoc "tree trunk, stick," Ger. Stock "stick, cane;" also Du. stuk, Ger. Stück "piece"), from PIE *(s)teu- (see steep (adj.)). Meaning "ancestry, family" (late 14c.) is a figurative use of the "tree trunk" sense (cf. family tree). This is also the root of the meaning "heavy part of a tool," and "part of a rifle held against the shoulder" (1540s). Stock, lock, and barrel "the whole of a thing" is recorded from 1817. Meaning "framework on which a boat was constructed" (early 15c.) led to figurative phrase on stocks "planned and commenced" (1660s). Stock-still (late 15c.) is lit. "as still as a tree trunk."