"Super" in Spanish is "super". It is pronounced "SUE-pare". Please see this site for confirmation of the translation: http://www.answers.com/library/Translations
supertriste is not a spanish word, but it looks like a combination of the english word super and the spanish word for "sad", so it might mean "supersad"
Super poderes
you are super pretty
The spanish word for guitar is Guitarra. This English word came directly from the Spanish word, but it is not a Spanish word any more than the Spanish word is an Arabic word. "qutar" or a Greek word Chirara.
Estás muy/super grande.
"De" is the Spanish word for "of".
The spanish word for did is hizo.
The Spanish word for "she" is "ella".
The Spanish word for "in" is "en".
"Con" is the spanish word for "with".
The Spanish word for "who" is "quién".
According to the Royal Spanish Academy, there is no such word in spanish.