SIDS vs cot death

SIDS and cot death both are nouns.

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

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

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

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

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