| PLENIST | • plenist n. One who believes that all space is full of matter. • PLENIST n. one who holds that all space is full of matter. |
| ALIENIST | • alienist n. (Dated) An expert in mental illness, especially with reference to legal ramifications. • alienist n. (Dated) A psychiatrist. • ALIENIST n. a psychiatrist specialising in legal aspects of mental illness. |
| EUGENIST | • eugenist n. An advocate or supporter of eugenics. • EUGENIST n. a student of eugenics. |
| LUTENIST | • lutenist n. One who plays the lute, a lutist. • LUTENIST n. a lute-player, also LUTANIST, LUTER, LUTIST. |
| ECUMENIST | • ecumenist adj. Supporting, or in accord with, ecumenism. • ecumenist n. A person who espouses ecumenism. • ECUMENIST n. an adherent of ecumenism, the doctrines and practice of the Christian ecumenical movement. |
| EPIGENIST | • epigenist n. A proponent of epigenesis. • EPIGENIST n. one who studies the gradual development of the embryo. |
| EUTHENIST | • euthenist n. One who studies or advocates euthenics. • EUTHENIST n. a student of euthenics, the science concerned with improving living conditions. |
| HYGIENIST | • hygienist n. A person skilled in hygienics, but especially a dental assistant who cleans teeth etc. • HYGIENIST n. one skilled in hygiene, also HYGEIST, HYGIEIST. |
| LARCENIST | • larcenist n. One who commits larceny, a thief. • LARCENIST n. one who commits larceny, also LARCENER. |
| LICHENIST | • lichenist n. One who studies lichens. • LICHENIST n. one who studies lichen. |
| RIPIENIST | • ripienist n. (Music) A musician in the ripieno portion of an orchestra, especially as opposed to a soloist or concertino section. • RIPIENIST n. a supplementary instrumentalist. |
| ABIOGENIST | • abiogenist n. (Biology) One who believes that life can be produced independently of antecedent life. • ABIOGENIST n. a believer in abiogenesis, the supposed spontaneous origination of living organisms directly from lifeless matter. |
| MONOGENIST | • monogenist n. (Anthropology, historical) One who maintains that all members of the human race belong to a single species. • MONOGENIST n. a believer in monogenism. |
| POLYGENIST | • polygenist n. One who maintains that animals of the same species are descended from more than one original pair. • POLYGENIST n. one who maintains that animals of the same species have sprung from more than one original pair. |
| ETHNOGENIST | • ETHNOGENIST n. a student of ethnogeny. |
| MISCEGENIST | • miscegenist n. One who favours miscegenation. • MISCEGENIST n. a person who favours or practises miscegenation, also MISCEGENATOR. |
| PHENOMENIST | • phenomenist n. Synonym of phenomenalist. • PHENOMENIST n. a believer in phenomenism. |
| PHILLUMENIST | • phillumenist n. A person who collects match-related items, like matchbox labels, matchboxes, matchbooks, or matchbook covers. • PHILLUMENIST n. a collector of matchbooks. |
| PHILHELLENIST | • Philhellenist n. A philhellene. • PHILHELLENIST n. one who loves Greece, also PHILHELLENE. |
| GEOMORPHOGENIST | • GEOMORPHOGENIST n. a student of geomorphogeny, the study of the origins of land forms. |