残り (nokori) means “the rest” | MotiTan Japanese Dictionary

More examples

ケーキの残りを食べます。kē ki no noko ri o ta be ma su

I eat the rest of the cake.

残りのページは明日読みます。noko ri no pē ji wa asu yo mi ma su

I will read the rest of the pages tomorrow.

Describes what is still present or available after other parts have been taken, used, or completed.

余りamari: The amount or part left over after something has been used, divided, or finished.

全体から一部がなくなったあとに、まだ存在したり利用できたりするもの。zen tai ka ra ichi bu ga na ku na tta a to ni ma da son zai shi ta ri ri yō de ki ta ri su ru mo no

残り (nokori) comes from 残る (nokoru, "to remain"), a native Japanese verb, with the verb's continuative form functioning as a noun.

Japanese often places 残り (nokori) before a number, as in 残り一つ (nokori hitotsu), whereas English commonly says "one left" with the number first.