red oak: any of numerous American oaks having 4 stamens in each floret, acorns requiring two years to mature and leaf veins usually extending beyond the leaf margin to form points or bristles
oak: a deciduous tree of the genus Quercus; has acorns and lobed leaves
vent: a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt