Noun

• S: (n) hiss, hissing, hushing, fizzle, sibilation (a fricative sound (especially as an expression of disapproval)) "the performers could not be heard over the hissing of the audience"
• S: (n) boo, hoot, Bronx cheer, hiss, raspberry, razzing, razz, snort, bird (a cry or noise made to express displeasure or contempt)

Verb

• S: (v) hiss, siss, sizz, sibilate (make a sharp hissing sound, as if to show disapproval)
• S: (v) hiss, whoosh (move with a whooshing sound)
• S: (v) hiss, sizz, siss, sibilate (express or utter with a hiss)
• S: (v) boo, hiss (show displeasure, as after a performance or speech)