bush vs bush-league

bush is a noun but bush-league is not a noun.

Word	Noun	Adjective	Verb	Adverb
bush	Yes	Yes	Yes	No
bush-league	No	Yes	No	No

As adjectives, bush and bush-league are synonyms defined as:

bush (noun)	bush-league (noun)
hair growing in the pubic area
dense vegetation consisting of stunted trees or bushes
a large wilderness area
a low woody perennial plant usually having several major stems

bush (adjective)	bush-league (adjective)
not of the highest quality or sophistication	not of the highest quality or sophistication

bush (verb)	bush-league (verb)
provide with a bushing