1) Guyot 1) Mount 2) Mountain 3) Underwater peak 
A submarine volcano.
A submarine volcano Detailed definition of Seamount
large submarine volcanic mountain rising at least 1,000 m (3,300 feet) above the surrounding deep-sea floor; smaller submarine volcanoes are called ... [5 related articles]
an isolated, steep-sided, peak on the seafloor usually caused by volcanic activity. Generally, seamounts rise at least 1000m, though biologists often include shorter submarine peaks.
an isolated mountain situated on the sea floor.
A submarine volcano.
A conical underwater mountain formed by a volcano and rising 1000 meters or more from the sea floor.
A mountain on the sea floor that has at least 1000 meters of local relief. Most seamounts are shield
An isolated, conical mound rising more than 1000 m above the ocean floor. Seamounts are probably submerged shield volcanoes.
A submarine volcano.
A volcanic mountain found on an ocean basin that has an origin not related to a mid-oceanic ridge or a tectonic subduction zone.
An isolated tall mountain on the sea floor that may extend more than 1 kilometer from base to peak (see also guyot).
[n] - an underwater mountain rising above the ocean floor
Conical mountain rising 1000 m or more above the sea floor.
noun an underwater mountain rising above the ocean floor
an extinct, underwater volcano that rises more than 1 km above the seafloor but whose peak is below the sea surface.
(guyot) A volcanic mountain on the seafloor. If flat-topped, it is a guyot.
Isolated undersea mountain (usually a volcano) with the summit lying well below the ocean surface.