extinction vs extermination

extinction and extermination both are nouns.

Word	Noun	Adjective	Verb	Adverb
extinction	Yes	No	No	No
extermination	Yes	No	No	No

As nouns, extinction and extermination are synonyms defined as:

extinction (noun)	extermination (noun)
the act of extinguishing; causing to stop burning	the act of exterminating
a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus	complete annihilation
complete annihilation
the reduction of the intensity of radiation as a consequence of absorption and radiation
no longer in existence
no longer active; extinguished