estampilla
stamp
estampa
stamp, print
+
-illa
diminutive suffix
Estampilla means stamp and can be thought of as estampa0 (stamp, print0) + -illa1 (diminutive suffix1), literally meaning 'little stamp'.
noun
- stampA small adhesive piece of paper used on mail as evidence of payment of postageNecesito comprar una estampilla para enviar esta carta. // I need to buy a stamp to send this letter.