creo que Sur es un substantivo -- a noun in english. Sud es el adjectivo-- an adjective in english. Probably it is confusing because in english the noun and adjective are the same word-- South. We say South America is to the South. In spanish it is Sud America esta al sur. so they say America del Sur o Sud America. In English that would be America of the South (which we don't say), or South America. But I have heard "Song of the South", which would be "Cancion del Sur".

Hola Leslie. Para profundizar un poco más en la pregunta, te recomiendo estos dos artículos. http://castellanoactual.com/suramericano-o-sudamericano/ http://www.fundeu.es/consulta/suramerica-o-sudamerica-147/ Un abrazo. :)M

Don't worry, though. When you speak about south in general, you should always use "sur". However, when it is a prefix, it can adopt the sud- form as long as it is followed by a vocal. Therefore: sureste/sudeste, suroeste/sudoeste, suroriental/sudoriental, suroccidental/sudoccidental, Sudamérica/Suramérica, Sudáfrica/Suráfrica, surasiático/sudasiático, surcoreano, survietnamita... This is explained in the DPD (Diccionario Panhispánico de Dudas) ^^

Sud existe como palabra independiente y como prefijo (Sud-). Como palabra independiente, es un nombre poco usado que significa Sur. Sud- como prefijo indica el sur: sudoeste, sudamericano... En el diccionario de la Real Academia Española: sud. 1. m. Am. p. us. sur. sud-. (Cf. sur). 1. elem. compos. Significa 'sur'. Sudoeste, sudafricano.

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