trebuchet vs trebucket

trebuchet and trebucket both are nouns.

Word	Noun	Adjective	Verb	Adverb
trebuchet	Yes	No	No	No
trebucket	Yes	No	No	No

As nouns, trebuchet and trebucket are synonyms defined as:

trebuchet and trebucket: catapult that uses a swinging arm to throw a projectile

trebuchet (noun)	trebucket (noun)
catapult that uses a swinging arm to throw a projectile	catapult that uses a swinging arm to throw a projectile