thermic fever vs siriasis

thermic fever and siriasis both are nouns.

Word	Noun	Adjective	Verb	Adverb
thermic fever	Yes	No	No	No
siriasis	Yes	No	No	No

As nouns, thermic fever and siriasis are synonyms defined as:

thermic fever and siriasis: sudden prostration due to exposure to the sun or excessive heat

Other synonyms of thermic fever include insolation, sunstroke.

thermic fever (noun)	siriasis (noun)
sudden prostration due to exposure to the sun or excessive heat	sudden prostration due to exposure to the sun or excessive heat