IPA: /ˈʃoʊruːm/
KK: /ˈʃoʊˌrum/
A space or room used to display products for customers to see and buy.
The new car showroom had a variety of models on display.
Showroom → It is formed from "show" (from Old English "sceawian", meaning to look at or to see) and "room" (from Old English "rum", meaning space or area). A showroom is a space designed for displaying items for viewing or inspection.
Think of a place where you 'look at' ('show') things in a designated 'space' ('room') — that's what a showroom is.
No commonly confused words.