vs 

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"Cadáveres" is a form of "cadáver", a noun which is often translated as "cadaver". "Calaveras" is a form of "calavera", a noun which is often translated as "skull". Learn more about the difference between "cadáveres" and "calaveras" below.
el cadáver(
kah
-
dah
-
behr
)
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. cadaver
Tardé algo en acostumbrarme a realizar experimentos en cadáveres cuando estudié medicina.It took me a while to adjust to experimenting on a cadaver when I was at Med School.
b. body
Parece que hay muchos cadáveres entre los escombros dejados por el terremoto.It seems there are many bodies under the rubble left by the earthquake.
c. corpse
Como patóloga, Clara está habituada a trabajar con cadáveres.As a pathologist, Clara is used to working with corpses.
d. carcass (of an animal)
Hoy vi el cadáver de un venado tirado a un lado de la carretera.I saw the carcass of a deer on the side of the road today.
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la calavera(
kah
-
lah
-
beh
-
rah
)
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
feminine noun
a. skull
Las paredes de las catacumbas están cubiertas de calaveras.The walls of the catacombs are covered in skulls.
2. (rear light)
Regionalism used in Mexico
(Mexico)
a. tail light
Rompí una calavera mientras estacionaba.I broke a tail light while parking.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
3.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(libertine)
a. rake
Toda su vida ha sido un calavera.He has been a rake all his life.
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