Expedience
Part of speech: noun
Definition: Speed or urgency Something that is expedient.
Expediency
Part of speech: noun
Definition: Suitability for particular circumstance or situation.The state of being expedient; expedience.
Example sentence: Whether it was the Alaskan pipeline disaster or the Texas City refinery fire where 15 people died, time after time it's been shown that BP chooses expediency over safety.