water wagon vs water waggon

water wagon and water waggon both are nouns.

Word	Noun	Adjective	Verb	Adverb
water wagon	Yes	No	No	No
water waggon	Yes	No	No	No

As nouns, water wagon and water waggon are synonyms defined as:

water wagon and water waggon: a wagon that carries water (as for troops or work gangs or to sprinkle down dusty dirt roads in the summertime)

water wagon (noun)	water waggon (noun)
a wagon that carries water (as for troops or work gangs or to sprinkle down dusty dirt roads in the summertime)	a wagon that carries water (as for troops or work gangs or to sprinkle down dusty dirt roads in the summertime)