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"Mas" is a form of "mas", a conjunction which is often translated as "but". "Muy" is an adverb which is often translated as "very". Learn more about the difference between "mas" and "muy" below.
mas(
mahs
)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.
muy(
mwee
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).