shotgun vs scattergun

shotgun and scattergun both are nouns.

Word	Noun	Adjective	Verb	Adverb
shotgun	Yes	No	No	No
scattergun	Yes	No	No	No

As nouns, shotgun and scattergun are synonyms defined as:

shotgun and scattergun: firearm that is a double-barreled smoothbore shoulder weapon for firing shot at short ranges

shotgun (noun)	scattergun (noun)
firearm that is a double-barreled smoothbore shoulder weapon for firing shot at short ranges	firearm that is a double-barreled smoothbore shoulder weapon for firing shot at short ranges