Definition: A medical doctor who focuses on diagnosing and treating conditions related to the joints, such as arthritis.

Example: After months of pain, I finally decided to see a rheumatologist for my joint issues.

Definition: A person who is trained to use a rifle, often in a military context.

Example: The rifleman took aim at the target with precision.

Definition: A person or thing that sets up or adjusts equipment, especially in construction or maritime contexts.

Example: The rigger carefully secured the equipment before the lift.

Definition: A person who leads a group, especially in activities that are not legal or are considered wrong.

Example: The police arrested the ringleader of the gang after a long investigation.

Definition: A person who takes chances or engages in risky activities.

Example: As a risker, she often invests in new and uncertain business ventures.

Definition: Describing someone or something that competes with another for the same goal or position.

Example: The rival teams faced off in the championship game.

Definition: To compete with someone or something in a contest or rivalry.

Example: The two companies rival each other in the tech industry.

Definition: A person or group that competes with another in a particular area, trying to achieve the same goal or surpass them.

Example: The two companies have been rivals for years, each trying to outdo the other in sales.

Definition: To try to be as good as someone else or to do better than them.

Example: She hopes to rival her brother's achievements in sports this year.

Definition: A tool or machine that is used to fasten pieces of metal together by inserting rivets, or a person who does this job.

Example: The riveter worked diligently to secure the metal panels of the aircraft.

Definition: A person who carries and holds a rod used for measuring in surveying work.

Example: The rodsman carefully positioned the leveling rod to ensure accurate measurements.

Definition: A part or character that someone plays in a performance, or a specific function or position that someone has in a situation or organization.

Example: In the play, she took on the role of the main character.

Definition: An event where a vehicle turns over onto its side or roof, or the process of transferring funds from one account to another, such as in retirement accounts.

Example: The rollover caused significant damage to the car, but thankfully no one was injured.