(n)remainder, balance, residual, residue, residuum, restsomething left after other parts have been taken away“there was no remainder”, “he threw away the rest”, “he took what he wanted and I got the balance”
(n)rest, eternal rest, sleep, eternal sleep, quietuseuphemisms for death (based on an analogy between lying in a bed and in a tomb)“she was laid to rest beside her husband”, “they had to put their family pet to sleep”
(v)stay, remain, reststay the same; remain in a certain state“The dress remained wet after repeated attempts to dry it”, “rest assured”, “stay alone”, “He remained unmoved by her tears”, “The bad weather continued for another week”