A website is a presence on the World Wide Web. As of 2017, there are more than one billion. To qualify as a bona fide site, it must be available over the Internet around the clock.
Tube means a hollow cylinder. An example of a tube is manicotti pasta. The definition of a tube is a pliable container with a screw cap at one end to keep it closed. An example of tube is the container that toothpaste comes in.
trough. 1. a long, narrow, open receptacle, usu. boxlike in shape, used chiefly to hold water or food for animals. 2. any of several similarly shaped receptacles used for various commercial or household purposes. 3. a channel or conduit for conveying water, as a gutter under the eaves of a building. 4. any long depression or hollow. 5. a long, wide, and deep depression in the ocean floor having gently sloping sides, wider and shallower than a trench. 6. an elongated area of relatively low barometric pressure.