sudden infant death syndrome vs crib death

sudden infant death syndrome and crib death both are nouns.

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

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

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

Other synonyms of sudden infant death syndrome include cot death, infant death, SIDS.

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