strep throat vs throat infection

strep throat and throat infection both are nouns.

Word	Noun	Adjective	Verb	Adverb
strep throat	Yes	No	No	No
throat infection	Yes	No	No	No

As nouns, strep throat and throat infection are synonyms defined as:

strep throat and throat infection: an infection of the oral pharynx and tonsils by streptococcus

Other synonyms of strep throat include septic sore throat, streptococcal sore throat, streptococcus tonsilitis.

strep throat (noun)	throat infection (noun)
an infection of the oral pharynx and tonsils by streptococcus	an infection of the oral pharynx and tonsils by streptococcus