| APATOSAURUSES | • apatosauruses n. Plural of apatosaurus. • APATOSAURUS n. a kind of long-necked dinosaur, also APATOSAUR. |
| AQUAFITNESSES | • AQUAFITNESS n. fitness obtained through water-based exercise. |
| ASSUEFACTIONS | • ASSUEFACTION n. (obsolete) habituation. |
| AUREATENESSES | • AUREATENESS n. the state of being aureate. |
| CAUSATIONISMS | • CAUSATIONISM n. the principle of universal causation. |
| CAUSATIONISTS | • causationists n. Plural of causationist. • CAUSATIONIST n. a believer in causationism. |
| CAUSATIVENESS | • causativeness n. The quality of being causative. • CAUSATIVE n. relating to causation. |
| EUTHANASIASTS | • EUTHANASIAST n. a supporter of euthanasia. |
| FACTUALNESSES | • FACTUALNESS n. the state of being factual. |
| MUTESSARIFATS | • mutessarifats n. Plural of mutessarifat. • MUTESSARIFAT n. the office of a mutessarif, the head of a Turkish sanjak, a district or a subdivision of a vilayet. |
| NATURALNESSES | • naturalnesses n. Plural of naturalness. • NATURALNESS n. the state of being natural. |
| PANSEXUALISTS | • pansexualists n. Plural of pansexualist. • PANSEXUALIST n. a believer in pansexualism. |
| QUASICRYSTALS | • quasicrystals n. Plural of quasicrystal. • quasi-crystals n. Plural of quasi-crystal. • QUASICRYSTAL n. a body of solid material that resembles a crystal in being composed of repeating structural units but that incorporates two or more unit cells into a quasiperiodic structure. |
| SESQUIALTERAS | • sesquialteras n. Plural of sesquialtera. • SESQUIALTERA n. a perfect fifth; three notes against two; an organ stop giving the root, the twelfth and the tierce. |
| SHAMATEURISMS | • SHAMATEURISM n. the retention of amateur status while receiving payment for playing or competing. |
| STEGOSAURIANS | • stegosaurians n. Plural of stegosaurian. • STEGOSAURIAN n. any quadrupedal herbivorous ornithischian dinosaur of the suborder Stegosauria. |
| SUBHASTATIONS | • subhastations n. Plural of subhastation. • SUBHASTATION n. (historical) sale by public auction. |
| SUBSIDIARIATS | • SUBSIDIARIAT n. a collective term for the news sources that would not survive without being subsidized directly (by a government, etc.). |
| SUBSTANTIATES | • substantiates v. Third-person singular simple present indicative form of substantiate. • SUBSTANTIATE v. to give substance or form to. |