more than is usual, allowed etc

overabundance of something

additional; beyond what is usual, expected or arranged

accessory; excess

an amount of a drug that is too much

excess

something that remains; the rest

balance, residue

a small (usually unwanted) piece; a small amount

tiny bit of something

kept for use when needed; additional to what is being or will be used; a spare part (for a machine or engine); (to agree) to avoid hurting, punishing, destroying, (a person, building etc)

extra, reserve

more than is needed or wanted

extra, unnecessary

an amount (of money, goods etc) that remains after needs have been supplied

extra

not similar in size, quality etc; (of a surface) not level, not smooth

not smooth or balanced