-or; -our (primarily British)

(Latin: a suffix; state of, result of; he who, that which)

A suffix that forms nouns. British spelling is usually -our.
annihilator (s) (noun), annihilators (pl)
archtraitor (s) (noun), archtraitors (pl)
Primary traitor, or traitors; specifically, Satan and Judas Iscariot: In some religious faiths, Satan and Judas Iscariot are considered archtraitors based on the stories of their betrayals of others.
aspirator (s) (noun), aspirators (pl)
assenter, assentor (s) (noun); assenters, assentors (pl)
Those who agree, cooperate with, or approve of an action or a plan: Most of the parents were assenters to the decision of the school to delay the beginning of classes by one hour each day on a regular schedule.

All of the students were assentors to the plans for the dance on Saturday.

astrogator
Someone; usually a man, who navigates in outer space either in interplanetary travel or in interstellar travel.
attestor
1. Someone who attests to the genuineness of a document or signature by adding his/her own signature.
2. Someone who attests or vouches for.
auditor
1. A qualified accountant who inspects the accounting records and practices of a business or other organization.
2. A university, or college, student registered for a course without getting credit and with no obligation to do any of the work assigned to the class.
3. Someone who listens attentively.
auscultator
A person who performs auscultation; that is, someone who uses a procedure for detecting certain defects or conditions by listening for normal and abnormal heart, breath, bowel, fetal, and other sounds in the body.
auspicator (s) (noun), auspicators (pl)
Someone or something that predicts that an event will take place: "The dark clouds and thunder were the auspicators that indicated a rainstorm was coming."
bioreactor
1. A microorganism that, through its biochemical reactions, can produce medically or commercially useful materials, e.g., beer from fermentation of yeast or insulin from genetically altered bacteria.
2. A living cell culture genetically engineered to produce materials useful for research in biology, medicine, and industrial processes.
3. A large tank for growing microorganisms used in industrial production.
biosensor (s) (noun), biosensors (pl)
1. A device that feels and analyzes biological information: A biosensor is a device such as a thermometer which is used to assess or analyze the temperature of blood pressure, heart rate, or a more sophisticated determination of chemicals and enzymes in body fluids.

The biosensor can also be used in the laboratory or placed within the body.

2. A device to monitor and to transmit information about biological processes; such as, the effect of motion on an animal in space: After many trials, the scientists developed a biosensor that worked in the weightlessness of the space capsule.
bisector
candor (s) (noun), candors (pl)
The state of being sincere and honest in speech or expressing oneself: Alice admired Jim's candor when he was talking about what went wrong with his first marriage.
A frank or harsh comment.
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An obvious response.
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canor (s) (noun), canors (pl)
Melody or sweet singing.
captor (s) (noun), captors (pl)