vs 

QUICK ANSWER
"OK" is an interjection which is often translated as "OK", and "muchas gracias" is a phrase which is often translated as "thank you very much". Learn more about the difference between "OK" and "muchas gracias" below.
OK(
oh
-
key
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. OK
Salgo ahora. Te mandaré otro mensaje de texto cuando llegue allí. - OK. Buen viaje.I'm leaving now. I'll text you again once I'm there. - OK. Have a nice trip.
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muchas gracias(
moo
-
chahs
 
grah
-
syahs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. thank you very much
¡Muchas gracias por la manzana!Thank you very much for the apple!
b. thanks a lot
Muchas gracias por llevarme al aeropuerto.Thanks a lot for taking me to the airport.
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