Rapidly.
a 4 letter word that begins with r is rice
Robbery is a sad word. It begins with the letter R.
Robotic surgery is a technology. It begins with the letter r.
Reversal is a synonym for the word switch. It begins with the letter r.
One four letter word that starts with r is riot.
A synonym for mother that begins with R is relative.
* roses
Rimming
A word beginning with R for sleep is rest.
reporter, recorder
Rain is a weather word. It begins with the letter r.
Reduction is a synonym for sale. It begins with the letter r.