pass away vs buy it

pass away and buy it both are verbs.

Word	Noun	Adjective	Verb	Adverb
pass away	No	No	Yes	No
buy it	No	No	Yes	No

As verbs, buy it is a hyponym of pass away; that is, buy it is a word with a more specific, narrower meaning than pass away:

pass away: pass from physical life and lose all bodily attributes and functions necessary to sustain life
buy it: be killed or die

Other hyponyms of pass away include abort, asphyxiate, stifle, suffocate, pip out, drown, predecease, famish, starve, fall, succumb, yield.

pass away (verb)	buy it (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	be killed or die
go out of existence