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