Noun and Suffix
ちがい
清掃員と副社長の違いなんて全く分からないね。
I really don’t see the difference between a garbage man and an executive vice president.
This is a single kanji with an い on the end, meaning you'd think it's probably an adjective. However in this case, it's a noun. What's the noun form of different? It's difference.
The reading is the same as the one you learned with the kanji. Not different at all.