flashbulb vs flashgun

flashbulb and flashgun both are nouns.

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

As nouns, flashbulb and flashgun are synonyms defined as:

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

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

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