IPA: /ˈɑːrtʃduːk/
KK: /ˈɑrtʃˌduk/
A high-ranking nobleman in certain royal families, particularly in Austria, who holds a title equivalent to a sovereign prince.
The archduke attended the royal ceremony with great dignity.
Archduke → It is formed from "arch-" (from Greek "archos", meaning chief or principal) and "duke" (from Old French "duc", meaning leader or commander). The term "archduke" refers to a chief or principal duke, often used in the context of certain royal titles in Europe.
Think of 'arch-' meaning chief and 'duke' meaning leader — an archduke is a chief leader among dukes.
No commonly confused words.