1. He is an ear, nose and throat specialist.

2. He is an ears, nose and throat specialist.

(Do we have to use 'ear' or 'ears'?)

1 answer

That type of specialist is called an ear, nose, and throat specialist. The plural is not used.

Sometimes it's abbreviated -- an ENT specialist:
http://www.google.com/search?q=ear+nose+throat+specialist+spring%2C+tx&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1&rlz=1I7GGIE_en