SIDS vs crib death

SIDS and crib death both are nouns.

Word	Noun	Adjective	Verb	Adverb
SIDS	Yes	No	No	No
crib death	Yes	No	No	No

As nouns, SIDS and crib death are synonyms defined as:

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

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

SIDS (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