flash bulb vs photoflash

flash bulb and photoflash both are nouns.

Word	Noun	Adjective	Verb	Adverb
flash bulb	Yes	No	No	No
photoflash	Yes	No	No	No

As nouns, flash bulb and photoflash are synonyms defined as:

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

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

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