vs 

QUICK ANSWER
"AM" is a form of "AM", an abbreviation which is often translated as "AM". "I" is a noun which is often translated as "i". Learn more about the difference between "AM" and "i" below.
An abbreviation is the shortened form of a word or group of words (e.g., "UFO" = "unidentified flying object"; "p." = "page").
abbreviation
a. AM
Estás sintonizando Radio Nova, AM 910.You're listening to Radio Nova, 910 AM.
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la i(
ee
)
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
feminine noun
a. i
"English" no empieza con una i."English" doesn't start with an i.
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