careta
mask
cara
face
+
-eta
diminutive suffix
Careta means mask and can be thought of as cara0 (face0) + -eta1 (diminutive suffix1), literally meaning a 'little face' or something that covers the face.
noun
- maskA mask that covers part or all of the faceLos niños usaron caretas en la fiesta de disfraces. // The children wore masks at the costume party.