flash lamp vs flashbulb

flash lamp and flashbulb both are nouns.

Word	Noun	Adjective	Verb	Adverb
flash lamp	Yes	No	No	No
flashbulb	Yes	No	No	No

As nouns, flash lamp and flashbulb are synonyms defined as:

flash lamp and flashbulb: a lamp for providing momentary light to take a photograph

Other synonyms of flash lamp include flash, flash bulb, flashgun, photoflash.

flash lamp (noun)	flashbulb (noun)
a lamp for providing momentary light to take a photograph	a lamp for providing momentary light to take a photograph