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"Béisbol" is a form of "béisbol", a noun which is often translated as "baseball". "El" is a form of "el", a definite article which is often translated as "the". Learn more about the difference between "béisbol" and "el" below.
el béisbol()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
el()
A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).