windows

(trademark) an operating system with a graphical user interface
a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air
a transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened
a transparent panel (as of an envelope) inserted in an otherwise opaque material
an opening that resembles a window in appearance or function;
the time period that is considered best for starting or finishing something;
a pane of glass in a window;
an opening in a wall or screen that admits light and air and through which customers can be served;
(computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen

windows is a valid Scrabble (US) TWL word

windows is a valid Scrabble Word in Merriam-Webster MW Dictionary

windows is a valid Scrabble Word in International Collins CSW Dictionary

windows is a valid Words With Friends word