bushel vs improve

bushel is a noun but improve is not a noun.

Word	Noun	Adjective	Verb	Adverb
bushel	Yes	No	Yes	No
improve	No	No	Yes	No

As verbs, improve is a hypernym of bushel; that is, improve is a word with a broader meaning than bushel:

bushel: restore by replacing a part or putting together what is torn or broken
improve: to make better

Other hypernyms of bushel include ameliorate, amend, better, meliorate.

bushel (noun)	improve (noun)
a British imperial capacity measure (liquid or dry) equal to 4 pecks
a United States dry measure equal to 4 pecks or 2152.42 cubic inches

bushel (verb)	improve (verb)
restore by replacing a part or putting together what is torn or broken	get better
	to make better