Words that are spelled with the letters EIGHT are pronounced as two sounds:
LONG A-T
or
LONG I-T
Yes, these 5 letters are pronounced with only 2 sounds.
Here are some examples:
Freight (F-R- LONG A-T)
Eight (LONG A-T)
Eighty (LONG A-T-LONG E)
Height (H-LONG I-T)
Sleight (S-L-LONG I-T)