Answer: serenes

AnswerCrossword Clue
SERENESCalms.
SERENESMakes calm.
SERENESTranquilizes.
SERENESCalm seas.
SERENESMakes placid.
SERENESTranquil expanses.
SERENESPeaceful expanses: Poet.
SERENESMakes tranquil.
SERENESCalm expanses
serenesSERENE, to tranquillize