12-letter words containing a, b, u, k, r
- underblanket — a blanket placed under a bottom sheet
- undertakable — able to be undertaken
- unmarketable — readily salable.
- unreckonable — to count, compute, or calculate, as in number or amount.
- unremarkable — notably or conspicuously unusual; extraordinary: a remarkable change.
- unremarkably — notably or conspicuously unusual; extraordinary: a remarkable change.
- unshrinkable — not able to contract or become smaller in size
- vacuum brake — a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse brake system