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"Muleta" is a form of "muleta", a noun which is often translated as "crutch". "Apoyo" is a form of "apoyo", a noun which is often translated as "support". Learn more about the difference between "muleta" and "apoyo" below.
la muleta()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
el apoyo()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
