stye vs eye infection

stye and eye infection both are nouns.

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

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

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

Other synonyms of stye include hordeolum, sty.

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