IPA: /ˈjɑrdˌstɪk/
KK: /jɑrdˌstɪk/
A tool used for measuring length that is one yard long, or a standard used to compare or judge something.
The teacher used a yardstick to measure the length of the classroom.
Yardstick is formed from "yard" (from Old English *gyrd*, meaning a rod or stick) and "stick" (from Old English *sticca*, meaning a stick or piece of wood). A yardstick is a measuring tool that is a stick of one yard in length.
Think of a 'yard' as a measurement and a 'stick' as a long piece of wood — together, they create a tool used for measuring length.
No commonly confused words.