flash lamp vs flashgun

flash lamp and flashgun both are nouns.

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

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

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

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

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