therest

As a noun remain is

state of remaining; stay.

As a verb remain is

to stay behind while others withdraw; to be left after others have been removed or destroyed; to be left after a number or quantity has been subtracted or cut off; to be left as not included or comprised.

Therest is likely misspelled.

Therest has no English definition.

As a verb remaining

is present participle of lang=en.

As a noun remaining

is an act or occurrence by which someone or something remains.

As an adjective remaining

is which remains, especially after something else has been removed.