Concepts 

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4906 total
name POS version def example status simulations
reptile noun one of a group of cold-blooded animals that have a backbone, lungs for breathing, dry, scaly skin, and clawed fingers or toes. Reptiles lay their eggs on dry land.
request verb to ask for something formally. The prisoner requested a visit to his mother
rescue verb to save someone who is injured or in danger.
research verb to study a subject in order to learn new facts or develop new ideas. Researching objects found on the seashore.
reserve verb to arrange to have something kept for a later time.
reservoir noun a large storage area where water is collected and stored for future use.
resign verb to give up your job.
resist verb v1 to try to stop something from happening. He resisted temptation.
resort noun a place where many people go for a vacation. A ski resort.
roll verb v1 to move by turning over and over. The logs rolled down the hill.
resource noun a supply of something useful or valuable, such as oil or gas. The country is rich in natural resources.
respect noun admiration for someone. I have great respect for her.
response noun a reply, in actions or words, to something.
responsible adjective sensible and dependable.
rest noun the time when you are relaxing.
restaurant noun a place where people go to buy and eat a meal.
restless adjective unable to stay still or relax. The baby had a restless night.
restore verb to fix something old or worn, so that it looks new or can be used again.
result noun the effect of certain actions or events. What was the result of the experiment?
retire verb to give up working, usually because of old age or illness.
return verb v1 to come back from somewhere. The boomerang returned easily to his hand.
revenge noun harm or injury that a person does to another, in return for something unpleasant previously done to them.
reverse verb v1 to go backward, usually in a vehicle. She reversed her motorcycle into the parking space.
reverse adjective v1 at the opposite side, inside, or back of an object. The reverse side of the coat is lined with white material.
revise verb to look back over work to make extra changes.
revolution noun v1 one complete turn.
reward noun a prize given because of a good thing someone has done. They offered a reward to anyone who found their cat.
rhinoceros noun a heavy mammal that lives in hot regions. Rhinoceroses have one or two horns and thick skin with hardly any hair.
rhubarb noun a large-leaved plant. Its long stems can be cooked and eaten as a dessert.
rhyme noun words that have the same or similar sound and are often found in a poem.