SIDS vs death

SIDS and death both are nouns.

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

As nouns, death is a hypernym of SIDS; that is, death is a word with a broader meaning than SIDS:

SIDS: sudden and unexpected death of an apparently healthy infant during sleep
death: the absence of life or state of being dead

Other hypernyms of SIDS include sleep apnea.

SIDS (noun)	death (noun)
sudden and unexpected death of an apparently healthy infant during sleep	the act of killing
	the event of dying or departure from life
	the permanent end of all life functions in an organism or part of an organism
	the absence of life or state of being dead
	a final state
	the time when something ends
	the time at which life ends; continuing until dead