Powerhead (pump)
Encyclopedia
An aquarium powerhead is a water pump completely submerged into an aquarium to circulate water throughout it. some can be just plopped in, put in the back so the water in the front will go one way to simulate a river for trout, or used as a fountain. The term "powerhead" is actually a brand name
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Genericized trademark
A genericized trademark is a trademark or brand name that has become the colloquial or generic description for, or synonymous with, a general class of product or service, rather than as an indicator of source or affiliation as intended by the trademark's holder...
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