- [x] ultimate
- [x] ultimately
- [ ] ultimatum
- [ ] ultraviolet
- [ ] unaided
- [ ] unconsolidated
- [ ] undergo
- [ ] underlying
- [ ] underneath
- [ ] underscore
- [ ] undertake
- [ ] unearth
- [ ] uneven
- [x] uniform
- [ ] unify
- [x] unique
- [ ] unity
- [x] universe
- [ ] unparalleled
- [ ] unprecedented
- [x] unpredictable
- [ ] unravel
- [ ] unsubstantiated
- [ ] untamed
- [ ] untappde
- [ ] up to
- [ ] up to date
- [ ] upheaval
- [ ] uppermost
- [ ] upside down
- [ ] urban
- [ ] urge
- [x] used to
- [ ] usher in
- [ ] utilitarian
- [ ] utility
- [x] utilize
- [ ] utmost
- [ ] utter