trash bin vs ashcan

trash bin and ashcan both are nouns.

Word	Noun	Adjective	Verb	Adverb
trash bin	Yes	No	No	No
ashcan	Yes	No	No	No

As nouns, trash bin and ashcan are synonyms defined as:

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

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