agora
/ˈaɡərə/

noun: agora; plural noun: agorae; plural noun: agoras

(in ancient Greece) a public open space used for assemblies and markets.

opus
/ˈəʊpəs,ˈɒpəs/

noun: opus; plural noun: opuses; plural noun: opera

an artistic work, especially one on a large scale.

"The best wrestler," he would say, "is not he who has learned thoroughly all the tricks and twists of the art, which are seldom met with in actual wrestling, but he who has well and carefully trained himself in one or two of them, and watches keenly for an opportunity of practising them." - Seneca