| APHORIST | • aphorist n. A person who creates or recites aphorisms. • APHORIST n. one who makes aphorisms, also APHORISER, APHORIZER. |
| ARBORIST | • arborist n. A person in the practice of arboriculture; a tree surgeon. • ARBORIST n. a tree specialist. |
| ARMORIST | • armorist n. (Heraldry) A person skilled in the bearings of coats of arms, and all relating to their emblazonment. • armorist n. (Uncommon) An armorer; one who produces arms and armor. • ARMORIST n. a person skilled in heraldry. |
| CALORIST | • calorist n. (Historical) A scientist who favoured the caloric theory, dealing with the hypothetical medium of heat. • CALORIST n. a person who believes in the caloric theory. |
| COLORIST | • colorist n. One who colors; an artist with a talent for coloring. • colorist n. A hairdresser who is a specialist in colouring and tinting hair. • COLORIST n. a person skilled in the use of color. |
| ERRORIST | • errorist n. One who encourages and propagates error. • errorist n. One who holds onto an erroneous belief. • ERRORIST n. one holding a mistaken opinion. |
| HUMORIST | • humorist n. (Medicine, now rare, historical) Someone who believes that health and temperament are determined by… • humorist n. (Obsolete) Someone subject to whims or fancies; an eccentric. • humorist n. A humorous or witty person, especially someone skilled in humorous writing or performance. |
| LABORIST | • laborist n. A physician who aids labor and delivery but does not provide prenatal care. • laborist n. A supporter of workers’ rights. • LABORIST n. a supporter of workers' rights, also LABOURIST, LABORITE. |
| MOTORIST | • motorist n. One who drives a motor vehicle. • MOTORIST n. one who travels by automobile. |
| RIGORIST | • rigorist n. Someone who takes the strictest interpretation of a law, religious injunction etc. • rigorist adj. Of, pertaining to or in the fashion of rigorists or rigorism. • RIGORIST n. one who professes rigorism. |
| TENORIST | • tenorist n. A tenor singer. • tenorist n. Someone who plays a tenor saxophone. • TENORIST n. one who sings tenor or plays a tenor instrument. |
| THEORIST | • theorist n. Someone who constructs theories, especially in the arts or sciences. • THEORIST n. one who theorizes. |