천적이 · 천적을
natural enemy, natural predator
Example
무당벌레는 진딧물의 천적으로 알려져 있어요.
Ladybugs are known as natural enemies of aphids.
Word parts
천 heaven+적 enemy
Literally 'heaven-given enemy'.
Good to know
Also used for people: 그 팀은 우리의 천적이야 'that team is our nemesis'.
Related words