ear doctor vs otologist

ear doctor and otologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
ear doctor	Yes	No	No	No
otologist	Yes	No	No	No

As nouns, ear doctor and otologist are synonyms defined as:

ear doctor and otologist: a physician who specializes in the ear and its diseases

Other synonyms of ear doctor include ear specialist.

ear doctor (noun)	otologist (noun)
a physician who specializes in the ear and its diseases	a physician who specializes in the ear and its diseases