litter basket vs litter-basket

litter basket and litter-basket both are nouns.

Word	Noun	Adjective	Verb	Adverb
litter basket	Yes	No	No	No
litter-basket	Yes	No	No	No

As nouns, litter basket and litter-basket are synonyms defined as:

litter basket and litter-basket: bin (usually in or outside a public building) into which the public can put rubbish

Other synonyms of litter basket include litterbin.

litter basket (noun)	litter-basket (noun)
bin (usually in or outside a public building) into which the public can put rubbish	bin (usually in or outside a public building) into which the public can put rubbish