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)