water wheel vs waterwheel

water wheel and waterwheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
water wheel	Yes	No	No	No
waterwheel	Yes	No	No	No

As nouns, water wheel and waterwheel are synonyms defined as:

water wheel and waterwheel: a wheel that rotates by direct action of water; a simple turbine

As nouns, water wheel and waterwheel are synonyms defined as:

water wheel and waterwheel: a wheel with buckets attached to its rim; raises water from a stream or pond

water wheel (noun)	waterwheel (noun)
a wheel that rotates by direct action of water; a simple turbine	a wheel that rotates by direct action of water; a simple turbine
a wheel with buckets attached to its rim; raises water from a stream or pond	a wheel with buckets attached to its rim; raises water from a stream or pond