Hiss can be either a noun or a verb.
Noun: The hiss from the tape deck was very annoying.
Verb: The cat tends to hiss at anyone he doesn't recognize.
The plural of hiss is hisses, but it a word generally used as a verb rather than a noun.
It can be (hissing snakes, hissing cats). It is the present participle of the verb to hiss, and is otherwise a verb form or a noun (gerund).
alger hiss
The Hiss ended in 2008.
The Hiss was created in 2001.
Hiss
Yes, they both hiss.
Mike Hiss was born in 1941.
Yehuda Hiss was born in 1946.
Hiss was a well-respected government offical.
Alger Hiss
A hiss is a sibilant sound made by angry or frustrated animals.