clemency vs reprieve

clemency and reprieve both are nouns.

Word	Noun	Adjective	Verb	Adverb
clemency	Yes	No	No	No
reprieve	Yes	No	Yes	No

As nouns, reprieve is a hyponym of clemency; that is, reprieve is a word with a more specific, narrower meaning than clemency:

clemency: leniency and compassion shown toward offenders by a person or agency charged with administering justice
reprieve: the act of reprieving; postponing or remitting punishment

Other hyponyms of clemency include commutation, re-sentencing, amnesty, free pardon, pardon, quarter, respite.

clemency (noun)	reprieve (noun)
leniency and compassion shown toward offenders by a person or agency charged with administering justice	the act of reprieving; postponing or remitting punishment
good weather with comfortable temperatures	a warrant granting postponement (usually to postpone the execution of the death sentence)
	an interruption in the intensity or amount of something
	a (temporary) relief from harm or discomfort

clemency (verb)	reprieve (verb)
	relieve temporarily
	postpone the punishment of a convicted criminal, such as an execution