The word "ACSAT" is a 5-letter word that can be spelled phonetically as /æksæt/. The first three letters, "ACS", are pronounced with the short 'a' sound, as in 'cat'. The last two letters, "AT", are pronounced with the short 'a' followed by the hard 't' sound, as in 'hat'. Therefore, the correct way to spell "ACSAT" is with an 'a' in both the first and last syllables, and a hard 't' at the end.