infant death vs sudden infant death syndrome

infant death and sudden infant death syndrome both are nouns.

Word	Noun	Adjective	Verb	Adverb
infant death	Yes	No	No	No
sudden infant death syndrome	Yes	No	No	No

As nouns, infant death and sudden infant death syndrome are synonyms defined as:

infant death and sudden infant death syndrome: sudden and unexpected death of an apparently healthy infant during sleep

Other synonyms of infant death include cot death, crib death, SIDS.

infant death (noun)	sudden infant death syndrome (noun)
sudden and unexpected death of an apparently healthy infant during sleep	sudden and unexpected death of an apparently healthy infant during sleep