Extinction, Become Extinct
noun, verbal noun, の adjective
Extinction where everything is destroyed is extinction.
ぜつめつ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
全ての種の鯨が絶滅の危機に瀕している訳ではない。
Not all species of whales are endangered.