IPA: /ˈwɔːrɪər/
KK: /ˈwɔrɪər/
A person who fights in battles or is very involved in a cause or conflict.
The warrior bravely led his troops into battle.
Warrior → The word 'warrior' comes from the Old French 'werreier' (meaning one who wages war), which is derived from 'werre' (meaning war) and the agent suffix '-ier' (meaning one who does). A warrior is thus someone who engages in war or battle.
Think of someone who 'wages war' ('werre') — that's why a warrior is a person who fights in battles.
No commonly confused words.