Glow lamp and Lightbulb

Glow lamp noun - A gas-discharge tube with a hot cathode; used in stroboscopes.

Lightbulb and glow lamp are semantically related in bulb topic. In some cases you can use "Lightbulb" instead a noun phrase "Glow lamp".

Lightbulb noun - Electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity.

Glow lamp and lightbulb are semantically related in bulb topic. You can use "Glow lamp" instead a noun "Lightbulb".