bow legs vs bandy legs

bow legs and bandy legs both are nouns.

Word	Noun	Adjective	Verb	Adverb
bow legs	Yes	No	No	No
bandy legs	Yes	No	No	No

As nouns, bow legs and bandy legs are synonyms defined as:

Other synonyms of bow legs include bow leg.

bow legs (noun)	bandy legs (noun)
outward curvature of the legs	outward curvature of the legs