[NeoTar]

-ough notoriously has anywhere between four and twelve different pronunciations (if you count strange example with a limited number of words, like hiccough for hiccup).

The point I believe the parent post is making is that you cannot assume that buses would rhyme with fuses, because English orthography is so inconsistent.

Which is partially true - I haven’t seen any research to the effect, but I’d guess you can still predict the pronunciation of an English word with better than a fifty percent chance of success.