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"Extra" is a form of "extra", an adjective which is often translated as "extra". "Super" is a form of "super", an adjective which is often translated as "estupendo". Learn more about the difference between "extra" and "super" below.
extra(
ehk
-
struh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (additional)
2. (spare)
a. de repuesto 
All of the extra food will be donated to charity after the event.Toda la comida de repuesto se donará a la organización benéfica después del evento.
3. (colloquial) (over-the-top)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. dramático 
His stories are hard to believe because they're so extra.Sus cuentos son difíciles de creer porque son tan dramáticos.
b. exagerado 
I don't want to look too extra, so I'll just wear jeans and a T-shirt.No quiero verme exagerada esta noche, así que llevaré jeans y una camiseta.
c. exigente 
Patricia is so extra. She always expects lavish gifts from her boyfriend.Patricia es muy exigente. Siempre espera regalos lujosos de su novio.
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
a. el extra (M), la extra (F)
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Her acting career began when she was an extra in a horror film.Su carrera como actriz comenzó cuando era una extra en una película de horror.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
a. particularmente 
Since you worked extra hard today, you can leave early.Dado que trabajaste particularmente duro hoy, puedes irte temprano.
super(
su
-
puhr
)An adjective is a word that describes a noun (e.g., the big dog).
1. (excellent)
d. bárbaro  (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Paco is a super guitar player.Paco es un guitarrista bárbaro.
e. chévere  (colloquial) (Latin America)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
There are some super prizes to be won.Se están ofreciendo unos premios chéveres.
f. padre  (colloquial) (Mexico)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in Mexico
We're going to Acapulco on vacation. - How super!Nos vamos a Acapulco de vacaciones. - ¡Qué padre!
g. macanudo  (colloquial) (Central America) (Southern Cone) (Venezuela)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in Central America: Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, and Panama
Regionalism used in Venezuela
I just got a job! - That is super news!¡Acabo de conseguir un trabajo! - ¡Qué noticias macanudas!
h. bacán  (South America)
Regionalism used in South America: Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, and Venezuela
This weekend we're going to Easter Island. - How super, dude!Este fin nos vamos a la Isla de Pascua. - ¡Qué bacán, poh!
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
2. (extremely)
a. super-  (colloquial) (prefix)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
That guy is super fast. I think he'll win.Ese tipo es superrápido. Creo que va a ganar.
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
3. (colloquial) (superintendent) (United States)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
Regionalism used in the United States
a. el conserje (M), la conserja (F)
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
I left a set of keys with the super.Dejé un juego de llaves con el conserje.