waste food (to be) thrown out, fed to pigs etc; rubbish, refuse (of any kind); useless or wrongly programmed data

refuse, litter

unused parts (especially of food or clothes)

remainder, remains

a collection of writings on various subjects by various authors

varied collection

(an instance of) the process of using many designs, materials etc to make a picture

miscellaneous collection

something that remains; the rest

balance, residue

a small part that remains; a length of clothes offered cheaply after most has been sold

leftover part

a small (usually unwanted) piece; a small amount

tiny bit of something

worthless material or writing; rubbish; refuse; worthless people

garbage