Nouns

(n)street arab, gamin, throwaway(sometimes offensive) a homeless boy who has been abandoned and roams the streets
(n)circular, handbill, bill, broadside, broadsheet, flier, flyer, throwawayan advertisement (usually printed on a page or in a leaflet) intended for wide distribution“he mailed the circular to all subscribers”
(n)throwawaywords spoken in a casual way with conscious under-emphasis

Adjectives

(s)cast-off, discarded, throwaway, thrown-awaythrown away“wearing someone's cast-off clothes”, “throwaway children living on the streets”, “salvaged some thrown-away furniture”
(s)throwawayintended to be thrown away after use“throwaway diapers”