eye infection vs stye

eye infection and stye both are nouns.

Word	Noun	Adjective	Verb	Adverb
eye infection	Yes	No	No	No
stye	Yes	No	No	No

As nouns, eye infection and stye are synonyms defined as:

eye infection and stye: an infection of the sebaceous gland of the eyelid

Other synonyms of eye infection include hordeolum, sty.

eye infection (noun)	stye (noun)
an infection of the sebaceous gland of the eyelid	an infection of the sebaceous gland of the eyelid