eye doctor vs ophthalmologist

eye doctor and ophthalmologist both are nouns.

Word	Noun	Adjective	Verb	Adverb
eye doctor	Yes	No	No	No
ophthalmologist	Yes	No	No	No

As nouns, eye doctor and ophthalmologist are synonyms defined as:

eye doctor and ophthalmologist: a medical doctor specializing in the diagnosis and treatment of diseases of the eye

Other synonyms of eye doctor include oculist.

eye doctor (noun)	ophthalmologist (noun)
a medical doctor specializing in the diagnosis and treatment of diseases of the eye	a medical doctor specializing in the diagnosis and treatment of diseases of the eye