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QUICK ANSWER
"Mas" is a form of "mas", a conjunction which is often translated as "but". "Algo" is a pronoun which is often translated as "something". Learn more about the difference between "algo" and "mas" below.
algo()
A pronoun is a word that stands in for a noun (e.g., she).
mas()
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
1. (literary) (contrasting)
A word or phrase restricted in usage to literature or established writing (e.g., sex, once upon a time).
a. but
Soy un caballero valiente, mas no soy agresivo.I am a valiant knight, but I am not aggressive.
