fire-wheel vs fire wheel

fire-wheel and fire wheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
fire-wheel	Yes	No	No	No
fire wheel	Yes	No	No	No

As nouns, fire-wheel and fire wheel are synonyms defined as:

fire-wheel and fire wheel: annual of central United States having showy long-stalked yellow flower heads marked with scarlet or purple in the center

Other synonyms of fire-wheel include blanket flower, Gaillardia pulchella, Indian blanket.

fire-wheel (noun)	fire wheel (noun)
annual of central United States having showy long-stalked yellow flower heads marked with scarlet or purple in the center	annual of central United States having showy long-stalked yellow flower heads marked with scarlet or purple in the center