throat infection vs septic sore throat

throat infection and septic sore throat both are nouns.

Word	Noun	Adjective	Verb	Adverb
throat infection	Yes	No	No	No
septic sore throat	Yes	No	No	No

As nouns, throat infection and septic sore throat are synonyms defined as:

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

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

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