| Word | Definitions | Synonyms |
|---|---|---|
| centreboard | (noun) a retractable fin keel used on sailboats to prevent drifting to leeward | Synonyms: centerboard, drop keel, sliding keel |
| treble | (noun) the pitch range of the highest female voice | Synonyms: soprano |
| trebuchet | (noun) catapult that uses a swinging arm to throw a projectile | Synonyms: trebucket |
| trebucket | (noun) catapult that uses a swinging arm to throw a projectile | Synonyms: trebuchet |