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