Iowa crab apple vs western crab apple

Iowa crab apple and western crab apple both are nouns.

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

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

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

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

Iowa crab apple (noun)	western 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