sunstroke vs siriasis

sunstroke and siriasis both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunstroke	Yes	No	No	No
siriasis	Yes	No	No	No

As nouns, sunstroke and siriasis are synonyms defined as:

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

Other synonyms of sunstroke include insolation, thermic fever.

sunstroke (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