drop dead vs predecease

drop dead and predecease both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop dead	No	No	Yes	No
predecease	No	No	Yes	No

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

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

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

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