Is there a difference between a laserjet printer and a laser printer?

Answer 1

There's essentially no difference. LaserJet is a deployed model of Hewlett-Packard (HP), which basically uses the same (or similar) technology as Laser printers.

LaserJet Printers:
LaserJets employ electro-photographic laser marking engines sourced from the Japanese company Canon. Most early printers used internal firmware, controllers, associated software, and drivers developed internally by HP and were considered their "value add" to the standard printer engines. Beginning with the LaserJet 4000, HP has nearly completely outsourced this work to Oak Technology, now Zoran Corporation, among many other suppliers.

Laser Printers:
A laser printer is a common type of computer printer that rapidly produces high quality text and graphics on plain paper. Like photocopiers, laser printers employ a xerographic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer's photoreceptor.

Hope that helps, cheers!

Answer 2

LaserJet is just the name that Hewlett Packard gave to its line of laser printers. There is no difference otherwise.

Answer 3

No. The word "Laserjet" simply is a model name of HP stressing the speed of the output (fast as a jet).