rate
rate is a valid 4-letter word worth 4 points in Scrabble and 4 points in Words with Friends.
What does rate mean?
Assign a rank or rating to.
“The restaurant is rated highly in the food guide”
Estimate the value of.
“How would you rate his chances to become President?”
“Gold was rated highly among the Romans”
Be worthy of or have a certain rating.
“This bond rates highly”
The relative speed of progress or change.
“he works at a great rate”
“the pace of events accelerated”
Amount of a charge or payment relative to some basis.
“a 10-minute phone call at that rate would cost $5”
A magnitude or frequency relative to a time unit.
“they traveled at a rate of 55 miles per hour”
“the rate of change was faster than expected”
A quantity or amount or measure considered as a proportion of another quantity or amount or measure.
“the literacy rate”
“the retention rate”