squirter vs water pistol

squirter and water pistol both are nouns.

Word	Noun	Adjective	Verb	Adverb
squirter	Yes	No	No	No
water pistol	Yes	No	No	No

As nouns, squirter and water pistol are synonyms defined as:

squirter and water pistol: plaything consisting of a toy pistol that squirts water

Other synonyms of squirter include squirt gun, water gun.

squirter (noun)	water pistol (noun)
plaything consisting of a toy pistol that squirts water	plaything consisting of a toy pistol that squirts water