suffix
suffix (sufijo)
a word part added to the end of a word that changes its meaning or its part of speech.
Example
The helpless puppy needed a careful owner. (-less means without; -ful means full of.)
In Spanish
suffix (sufijo) — una parte de palabra que se añade al final de una palabra y cambia su significado o su categoría gramatical.
The helpless puppy needed a careful owner. (-less significa sin; -ful significa lleno de.)