Iowa crab vs Iowa crab apple

Iowa crab and Iowa crab apple both are nouns.

Word	Noun	Adjective	Verb	Adverb
Iowa crab	Yes	No	No	No
Iowa crab apple	Yes	No	No	No

As nouns, Iowa crab and Iowa crab apple are synonyms defined as:

Iowa crab and Iowa crab apple: wild crab apple of western United States with fragrant pink flowers

Other synonyms of Iowa crab include Malus ioensis, prairie crab, western crab apple.

Iowa crab (noun)	Iowa crab apple (noun)
wild crab apple of western United States with fragrant pink flowers	wild crab apple of western United States with fragrant pink flowers