멸종이 · 멸종을
extinction
Example
기후 변화 때문에 많은 동물이 멸종 위기에 놓였어요.
Because of climate change, many animals are in danger of extinction.
Word parts
멸 destroy+종 species
Literally 'species destroyed'.
Good to know
Pronounced [멸쫑]: in Sino-Korean words, ㅈ after ㄹ becomes tense.