extinction vs quenching

extinction and quenching both are nouns.

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

As nouns, extinction and quenching are synonyms defined as:

extinction and quenching: the act of extinguishing; causing to stop burning

Other synonyms of extinction include extinguishing.

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no longer active; extinguished