throwaway vs thrown-away

throwaway is a noun but thrown-away is not a noun.

Word	Noun	Adjective	Verb	Adverb
throwaway	Yes	Yes	No	No
thrown-away	No	Yes	No	No

As adjectives, throwaway and thrown-away are synonyms defined as:

Other synonyms of throwaway include cast-off, discarded.

throwaway (noun)	thrown-away (noun)
an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
words spoken in a casual way with conscious under-emphasis
(sometimes offensive) a homeless boy who has been abandoned and roams the streets

throwaway (adjective)	thrown-away (adjective)
intended to be thrown away after use	thrown away
thrown away