As an adjective, use sibilant to describe something characterized by that hissing sound.

Is sibilance a noun?

a hissing quality of sound, or the hissing sound itself:I stretched out comfortably in my sleeping bag, peering up at the stars and listening to the ocean's gentle sibilance.

What do you mean by sibilant?

: having, containing, or producing the sound of or a sound resembling that of the s or sh in sash a sibilant speech sound sibilant breathing sibilant rales. sibilant. noun.