This is the 5604th most frequent Portuguese word.
am
"Am" is not a standalone word in Portuguese. It might be part of a conjugated verb like "Amaram" (they loved).
Here, 'am' is used as part of the time notation for 'before noon'.
Eu estou no parque às 10 am.
I am at the park at 10 am.
In this sentence, 'am' is not present; instead, 'amar' (to love) is used as a verb.
Amar você é o que me faz feliz.
Loving you is what makes me happy.
In this context, 'Am' stands for the musical chord A minor.