light bulb vs electric lamp

light bulb and electric lamp both are nouns.

Word	Noun	Adjective	Verb	Adverb
light bulb	Yes	No	No	No
electric lamp	Yes	No	No	No

As nouns, electric lamp is a hypernym of light bulb; that is, electric lamp is a word with a broader meaning than light bulb:

light bulb: electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity
electric lamp: a lamp powered by electricity

light bulb (noun)	electric lamp (noun)
electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity	a lamp powered by electricity