ornamentar
decorate
ornament
decorative object
+
-ar
verb suffix
Ornamentar means to decorate and can be thought of as ornament0 + -ar1 (verb1).
verb
  1. decorate
    To decorate or embellish something with ornaments or decorative elements
    Vamos a ornamentar el árbol de Navidad. // We're going to decorate the Christmas tree.