bow leg vs bowleg

bow leg and bowleg both are nouns.

Word	Noun	Adjective	Verb	Adverb
bow leg	Yes	No	No	No
bowleg	Yes	Yes	No	No

As nouns, bow leg and bowleg are synonyms defined as:

Other synonyms of bow leg include bandy leg, bandyleg, genu varum, tibia vara.

bow leg (noun)	bowleg (noun)
a leg bowed outward at the knee (or below the knee)	a leg bowed outward at the knee (or below the knee)
outward curvature of the legs

bow leg (adjective)	bowleg (adjective)
	have legs that curve outward at the knees