I
- ice lolly
- frozen fruit juice on a stick; ice pop (US: Popsicle),
- icing sugar
- (US: powdered sugar)
- industrial action
- (see article; US: job action)
- inverted commas
- quotation marks (see also American and British English differences – Punctuation)
- invigilator
- person who monitors an examination (US: proctor )
- ironmongery
- ironware, hardware; hardware store
Read more about this topic: List Of British Words Not Widely Used In The United States