throat infection vs raw throat

throat infection and raw throat both are nouns.

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

As nouns, raw throat is a hypernym of throat infection; that is, raw throat is a word with a broader meaning than throat infection:

throat infection: an infection of the oral pharynx and tonsils by streptococcus
raw throat: inflammation of the fauces and pharynx

Other hypernyms of throat infection include pharyngitis, sore throat, infection.

throat infection (noun)	raw throat (noun)
an infection of the oral pharynx and tonsils by streptococcus	inflammation of the fauces and pharynx