-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.
clamber, clamor, clamour
clamber (CLAM buhr, KLAM uhr) (verb)
To scramble, climb, or crawl in an awkward way: The children always clamber over the rocks.

We could only clamber up the steep hill.

clamor (KLAM uhr) (verb)
1. To cry loudly and insistently for something: An uninformed public will always clamor for an arrest in the case.
2. Acting in a loud and noisy way: The children obviously wanted to clamor around the musicians, and to sing songs and to laugh.
clamour (KLAM uhr [primarily British]) (verb)
To ask for or to demand something in a loud way: Fans were seen to clamour for autographs of the sports stars outside the stadium.

When the tourists tried to clamber down the hillside, they disrupted a flock of geese, the clamor of which could be heard for miles.

A British member of the group wrote a message in his e-mail: "It was almost as if the geese were trying to clamour for attention."

coagitator
combustor
1. A chamber in which air is mixed with a fuel and ignited.
2. The system in a gas turbine or jet engine that contains burners, ignitors (devices for lighting or igniting fuel), and injection devices in addition to the combustion chamber.
3. The combustion chamber together with burners, ignitors, and injection devices in a gas turbine or jet engine.
conductor (s) (noun); conductors (pl)
1. A person, etc. who conducts, leads, guides, etc.; one who leads, guides, or escorts; a leader, guide.
2. The director of an orchestra or chorus, who indicates to the performers the rhythm, expression, etc., of the music by motions of a baton or of the hands.
3. An official who has charge of the passengers, collects fares, and generally directs the proceedings, on an omnibus, tram, or a railroad train.
4. Anything that conducts, leads, or guides; a channel by which water, etc. is conducted.
5. A substance having the property of conducting or permitting the passage of heat, electricity, or other form of energy.
6. A device or arrangement (e.g. a wire, rod, or the like) for conducting electricity; that part of a cable, etc., by which the electricity is conducted.
congregator (s) (noun), congregators (pl)
Someone who brings a group, a multitude, or an assembly together: Dr. Farmer was an expert congregator who was able to draw large numbers of worshipers to listen to his sermons.
conjuror (s) (noun), conjurors (pl)
1. Variant spelling of conjurer.
2. Someone who performs magic tricks; a magician.
3. A sorcerer or sorceress.
conqueror (s) (noun), conquerors (pl)
1. Anyone who has enjoyed great success in war and has defeated an enemy or enemies: The great conqueror marched with his troops into the city with trumpets blaring and flags waving.
2. A person who has overcome an opponent in some kind of contest: Norbert was hailed as the conqueror after he had won five boxing matches in a row.
conservator
constrictor
1. A muscle which narrows an orifice or constricts an organ, or a muscle that tightens to make a part of the body narrower.
2. A snake which kills its prey by squeezing or constriction; such as, a python, boa constrictor, etc.
3. Someone or something that constricts somebody or something else.
contractor
1. A company or person with a formal contract to do a specific job, supplying labor and materials; as well as, providing and overseeing staff if necessary.
2. Someone who agrees to furnish materials or to perform services at a specified price; especially, for construction work.
3. Something that contracts; especially, a muscle in the body.
contributor (s) (noun), contributors (pl)
convector (s) (noun), convectors (pl)
1. A partly enclosed, heated surface from which warm air circulates: The convector in the ceiling, and the fan located there, ensured that the heated ventilation produced by the convector was being distributed more efficiently in the large living room.
2. A space heater that transfers heat to the surrounding area: Mark bought a new convector for his work room when the weather turned cold.
corroborator (s) (noun), corroborators (pl)
Someone who substantiates the truth of an action or statement.
councilor (s), councilors (pl) (nouns)
counselor, councilor
counselor (KOUN suh lur) (noun)
An adviser who provides guidance; usually an attorney: The counselor prepared the case to present to the judge.
councilor (KOUN suh lur) (noun)
A member of an assembly of people called together for consultation, deliberation, or discussion; such as, one which is convened to advise a governor: Dianna's neighbor was elected to be the city councilor for her area.

The councilor was elected to city hall; however, she felt unsure about all of the issues so she hired a counselor to assist her.