Iowa crab apple vs prairie crab

Iowa crab apple and prairie crab both are nouns.

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

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

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

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

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