perish vs succumb

perish and succumb both are verbs.

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

As verbs, succumb is a hyponym of perish; that is, succumb 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
succumb: be fatally overwhelmed

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

perish (verb)	succumb (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	consent reluctantly
	be fatally overwhelmed