pleuralgia vs costalgia

pleuralgia and costalgia both are nouns.

Word	Noun	Adjective	Verb	Adverb
pleuralgia	Yes	No	No	No
costalgia	Yes	No	No	No

As nouns, pleuralgia and costalgia are synonyms defined as:

pleuralgia and costalgia: pain in the chest caused by inflammation of the muscles between the ribs

Other synonyms of pleuralgia include pleurodynia.

pleuralgia (noun)	costalgia (noun)
pain in the chest caused by inflammation of the muscles between the ribs	pain in the chest caused by inflammation of the muscles between the ribs