vs 

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"O" is a noun which is often translated as "la o", and "an" is an indefinite article which is often translated as "un". Learn more about the difference between "o" and "an" below.
o(
o
)
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
noun
a. la o
(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)
The name "Olivia" starts with an o.El nombre "Olivia" empieza con una o.
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an(
ahn
)
An indefinite article is a word that indicates that a noun is not specific (e.g., a girl).
indefinite article
a. un (masculine)
That's an elephant.Eso es un elefante.
b. una (feminine)
I'd like an apple.Me gustaría una manzana.
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
preposition
a. cada
Paulina is paid $20 an hour.A Paulina le pagan $20 cada hora.
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