litterbug vs litter lout

litterbug and litter lout both are nouns.

Word	Noun	Adjective	Verb	Adverb
litterbug	Yes	No	No	No
litter lout	Yes	No	No	No

As nouns, litterbug and litter lout are synonyms defined as:

litterbug and litter lout: a person who litters public places with refuse

Other synonyms of litterbug include litterer.

litterbug (noun)	litter lout (noun)
a person who litters public places with refuse	a person who litters public places with refuse