Projector vs Lamp - What's the difference?

As a noun projector

is an optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen.

(internet) linux, apache, (mysql), and php — a popular combination of open source software for use as a web server.

* projectour (qualifier)

(wikipedia projector) (en noun)

An optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen.

(dated) A person who devises or manages projects; a planner.

(wikipedia lamp)

(en noun)

A device that generates heat, light or other radiation.

A device containing oil, burnt through a wick for illumination; an oil lamp.

A piece of furniture holding one or more electric light sockets.

* Davy lamp * table lamp

(en verb)

(slang) to hit, clout, belt, wallop

to hunt at night using a lamp; see lamping

(slang) to hang out or chill; to do nothing in particular