flashgun vs flashbulb

flashgun and flashbulb both are nouns.

Word	Noun	Adjective	Verb	Adverb
flashgun	Yes	No	No	No
flashbulb	Yes	No	No	No

As nouns, flashgun and flashbulb are synonyms defined as:

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

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

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