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"Barbilla" is a noun which is often translated as "chin", and "mentón" is a noun which is also often translated as "chin". Learn more about the difference between "barbilla" and "mentón" below.
la barbilla()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
el mentón()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
