IPA: /ˈɑːrtʃˌdʌtʃi/
KK: /ˈɑrtʃˌduːtʃi/
A region or territory ruled by an archduke or archduchess, often part of a larger empire or kingdom.
The archduchy was known for its rich culture and history.
Archduchy → It is formed from "arch-" (from Greek "archon", meaning chief or principal) and "duchy" (from Old French "duché", meaning the territory or domain of a duke). An archduchy refers to a principal territory ruled by an archduke, who is a chief duke.
Think of 'chief' ('arch-') ruling over a 'duchy' or territory — that's why an archduchy is a principal territory ruled by a chief duke.
No commonly confused words.