vs 

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"Cumpleañera" is a form of "cumpleañero", a noun which is often translated as "birthday boy". "Falta" is a form of "falta", a noun which is often translated as "lack". Learn more about the difference between "cumpleañera" and "falta" below.
el cumpleañero, la cumpleañera(
koom
-
plah
-
nyeh
-
roh
)
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
masculine or feminine noun
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(general)
a. birthday boy
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(masculine)
¿Dónde está el cumpleañero? - Está en el jardín, colgando los globos para la fiesta.Where's the birthday boy? - He's in the garden, hanging up the balloons for the party.
b. birthday girl
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(feminine)
Nos tienes que hacer una foto a todos con la cumpleañera.You must take a photo of all of us with the birthday girl.
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la falta(
fahl
-
tah
)
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
feminine noun
a. lack
No se ha construido el nuevo estadio por falta de fondos.The new stadium has not been built due to a lack of funds.
b. shortage
La falta de maestros preparados es un grave problema para este distrito.The shortage of trained teachers is a serious problem for this district.
a. absence
Cuando murió, nadie notó su falta.When she died, nobody noticed her absence.
a. offense (legal)
Esta falta conlleva una sentencia de diez años como mínimo.This offense carries a sentence of at least ten years.
b. foul (sports)
¿Cómo puedes decir que no fue falta? ¡Le entró por detrás!How can you say it wasn't a foul? He tackled him from behind!
c. fault (tennis)
"¡Falta!", gritó el árbitro."Fault!", shouted the umpire.
a. missed period
¿Has tenido falta? Puede que estés embarazada.Have you missed a period? It's possible you're pregnant.
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