perish vs predecease

perish and predecease both are verbs.

Word	Noun	Adjective	Verb	Adverb
perish	No	No	Yes	No
predecease	No	No	Yes	No

As verbs, predecease is a hyponym of perish; that is, predecease is a word with a more specific, narrower meaning than perish:

perish: pass from physical life and lose all bodily attributes and functions necessary to sustain life
predecease: die before; die earlier than

Other hyponyms of perish include abort, asphyxiate, stifle, suffocate, buy it, pip out, drown, famish, starve, fall, succumb, yield.

perish (verb)	predecease (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	die before; die earlier than