resource - n. anything of value that can be used or sold

responsible - ad. having a duty or job to do ("He is responsible for preparing the report."); being the cause of ("They were responsible for the accident.")

rest - v. to sit, lie down or sleep to regain¹ strength; n. that which remains²; the others

restrain³ - v. to keep controlled; to limit action by a person or group

restrict⁴ - v. to limit; to prevent from increasing or becoming larger

result - v. to happen from a cause; n. that which follows or is produced by a cause; effect

retire - v. to leave a job or position because one is old or in poor health

return - v. to go or come back; to bring, give, take or send back

revolt⁵ - v. to protest⁶ violently; to fight for a change, especially of government

rice - n. a food grain

rich - ad. having much money or goods; having plenty of something

ride - v. to sit on or in and be carried along; to travel by animal, wheeled vehicle, airplane or boat

right - n. what a person legally and morally should be able to do or have ("It is their right to vote."); ad. agreeing with the facts; good; correct; opposite wrong; on the side that is toward⁷ the east when one is facing north; opposite left

riot⁸ - v. to act with many others in a violent way in a public place; n. a violent action by a large group of people

rise - v. to go up; to go higher; to increase; to go from a position of sitting or lying to a position of standing⁹

risk - n. the chance of loss, damage or injury

river - n. a large amount of water that flows across land into another river, a lake or an ocean

road - n. a long piece of hard ground built between two places so people can walk, drive or ride easily from one place to the other

rob - v. to take money or property secretly or by force; to steal

rock - n. a hard piece of mineral matter

rocket - n. a device¹⁰ shaped like a tube that moves through air or space by burning gases and letting them escape from the back or bottom, sometimes used as a weapon

roll - v. to turn over and over; to move like a ball

room - n. a separate area within a building with its own walls

root - n. the part of a plant that is under the ground and takes nutrients¹¹ from the soil

rope - n. a long, thick piece of material made from thinner pieces of material, used for tying

rough - ad. not flat or smooth; having an uneven¹² surface; violent; not made well

round - ad. having the shape of a ball or circle

rub¹³ - v. to move something over the surface of another thing

rubber - n. a substance made from the liquid of trees with the same name, or a similar substance made from chemicals

ruin - v. to damage severely¹⁴; to destroy

rule - v. to govern or control; to decide; n. a statement or an order that says how something must be done

run - v. to move quickly by steps faster than those used for walking