acronymnoun
An acronym that is pronounced as if it were a single word.
abbreviationnoun
A group of initial letters used instead of a long name.
letternoun
Each of the signs used to write words.
siglaabbreviation
Excuse me, what does this acronym mean?
acronimoacronym
This abbreviation is read as an acronym, not letter by letter.
letteraletter
I'll repeat each letter slowly, so you don't get it wrong when you write it.