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QUICK ANSWER
"Thanks" is a form of "thanks", an interjection which is often translated as "gracias". "I'm fine" is a phrase which is often translated as "estoy bien". Learn more about the difference between "thanks" and "I'm fine" below.
thanks(
thahngks
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. gracias
Thanks for the ride home!¡Gracias por traerme a casa!
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
noun
a. las gracias
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(F)
We give thanks for this meal.Damos gracias por esta comida.
b. el agradecimiento
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(M)
I wrote him a letter of thanks for the lovely present.Le escribí una carta de agradecimiento por el bonito regalo.
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I'm fine(
aym
 
fayn
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. estoy bien
How are you, Laura? - I'm fine.¿Cómo estás, Laura? - Estoy bien.
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