armario
closet
arm
arm
+
-ario
place for
An armario is a closet, which can be thought of as a -ario1 (place for1) your arm0s and other things.
noun
  1. closet
    A piece of furniture with doors and shelves used for storing clothes, books, or other items
    Guardé mi ropa en el armario. // I put my clothes in the closet.