trash bin vs ash-bin

trash bin and ash-bin both are nouns.

Word	Noun	Adjective	Verb	Adverb
trash bin	Yes	No	No	No
ash-bin	Yes	No	No	No

As nouns, trash bin and ash-bin are synonyms defined as:

Other synonyms of trash bin include ash bin, ashbin, ashcan, dustbin, garbage can, trash barrel, trash can, wastebin.

trash bin (noun)	ash-bin (noun)
a bin that holds rubbish until it is collected	a bin that holds rubbish until it is collected