QUICK ANSWER
"Ah" is a form of "ah", an interjection which is often translated as "ah". "Muy" is an adverb which is often translated as "very". Learn more about the difference between "ah" and "muy" below.
ah(
ah
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
2. (used to express interrogation) (Latin America)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
muy(
mwee
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).