eye infection vs sty

eye infection and sty both are nouns.

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

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

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

Other synonyms of eye infection include hordeolum, stye.

eye infection (noun)	sty (noun)
an infection of the sebaceous gland of the eyelid	a pen for swine
	an infection of the sebaceous gland of the eyelid