Housing
Wasei-eigo in the Housing category — 4 words that look English but mean something completely different in Japanese.
マンション
manshon
An apartment building (usually reinforced concrete, mid-to-high range) ≠ mansion
マイホーム
maihōmu
An owned house, especially as a life goal (home ownership) ≠ my home
ワンルーム
wan rūmu
A studio apartment (single combined room with separate bath) ≠ one room
リフォーム
rifōmu
Home renovation, remodeling (kitchen, bathroom, etc.) ≠ reform