| BREAKTHROUGHS | • breakthroughs n. Plural of breakthrough. • BREAKTHROUGH n. an offensive thrust that penetrates and carries beyond a defensive line in warfare. |
| DRIVETHROUGHS | • drive-throughs n. Plural of drive-through. • DRIVETHROUGH n. a shop or restaurant designed so that customers can be served without leaving their cars. |
| ELEUTHERARCHS | • ELEUTHERARCH n. the chief of the eleutheri, an invented secret society. |
| HYPERTROPHOUS | • hypertrophous adj. (Dated, medicine) Hypertrophic. • HYPERTROPHOUS adj. of an organ, abnormally enlarged. |
| LAUGHWORTHIER | • LAUGHWORTHY adj. worthy of being laughed at. |
| MERRYTHOUGHTS | • merrythoughts n. Plural of merrythought. • MERRYTHOUGHT n. the furcula between the neck and breastbone of poultry, aka wishbone. |
| MOUTHBREATHER | • mouthbreather n. Alternative spelling of mouth breather. • mouth-breather n. Alternative spelling of mouth breather. • mouth␣breather n. A person who routinely inhales and exhales through the mouth, instead of through the nose. |
| THIRDBOROUGHS | • thirdboroughs n. Plural of thirdborough. • THIRDBOROUGH n. (historical) an under-constable. |
| THOROUGHBRACE | • thoroughbrace n. (Dated) A leather strap supporting the body of a carriage, and attached to springs or serving as a spring itself. • THOROUGHBRACE n. any of several leather straps supporting the body of a carriage and serving as springs. |
| THOROUGHBREDS | • thoroughbreds n. Plural of thoroughbred. • Thoroughbreds n. Plural of Thoroughbred. • THOROUGHBRED n. a horse so bred. |
| THOROUGHFARES | • thoroughfares n. Plural of thoroughfare. • THOROUGHFARE n. a through road. |
| THOROUGHWORTS | • thoroughworts n. Plural of thoroughwort. • THOROUGHWORT n. a wild flower with perfoliate leaves. |
| THUNDERSHOWER | • thundershower n. A rain shower accompanied by thunder and lightning. • THUNDERSHOWER n. a shower accompanied by lightning and thunder. |
| WATERTHRUSHES | • waterthrushes n. Plural of waterthrush. • WATERTHRUSH n. a species of American warbler. |