Answer:

whish

Answer	Crossword Clue
WHISH	Rustling sound
WHISH	Curtain-in-the-breeze sound
WHISH	Sibilant sound

WHISH	Soft, rushing sound
WHISH	Washing machine sound
WHISH	Elevator sound

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.