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"Mentiras" is a form of "mentira", a noun which is often translated as "lie". "Alejandro" is a proper noun which is often translated as "Alexander". Learn more about the difference between "mentiras" and "Alejandro" below.
la mentira(
mehn
-
tee
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rah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (falsehood)
2. (colloquial) (anatomy)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. white spot
Las mentiras de las uñas no se deben, como solía creerse, a una falta de calcio.White spots on fingernails are not caused, as was commonly believed, by a lack of calcium.