insolation vs siriasis

insolation and siriasis both are nouns.

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

As nouns, insolation and siriasis are synonyms defined as:

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

Other synonyms of insolation include sunstroke, thermic fever.

insolation (noun)	siriasis (noun)
therapeutic exposure to sunlight	sudden prostration due to exposure to the sun or excessive heat
incident solar radiation
sudden prostration due to exposure to the sun or excessive heat