What is another word for "phenomenon"?

Roget's Thesaurus (1911) lists these synonyms for "phenomenon": accident, accidental, adscititious, adventitious, apparent, appearance, ascititious, bomb, can, contingent, coup, curiosity, ego, eruption, external, extraneous, extrinsic, extrinsical, extrinsicality, fire, foreign, fortuitous, from, gazingstock, incidental, light, lion, marvel, mirabilis, miracle, modal, monster, non, nonessential, objective, objectiveness, outward, paint, peal, poi.