IPA: /ˈflæɡstæf/
KK: /ˈflæɡstæf/
A tall pole used to display a flag.
The national flag was raised on the flagstaff during the ceremony.
Flagstaff → The word is formed from "flag" (from Old Norse *flagg*, meaning a piece of cloth or banner) and "staff" (from Old English *stæf*, meaning a pole or stick). A flagstaff is a pole on which a flag is displayed.
Think of a 'piece of cloth' ('flag') being raised on a 'pole' ('staff') — that's what a flagstaff is.
No commonly confused words.