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QUICK ANSWER
"El" is a form of "el", a definite article which is often translated as "the". "La momia" is a form of "momia", a noun which is often translated as "mummy". Learn more about the difference between "el" and "la momia" below.
A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
