"Dos mil" is an adjective which is often translated as "two thousand", and "doce" is an adjective which is often translated as "twelve". Learn more about the difference between "dos mil" and "doce" below.
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An adjective is a word that describes a noun (e.g. the big dog).
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).