flying bird vs keel

flying bird and keel both are nouns.

Word	Noun	Adjective	Verb	Adverb
flying bird	Yes	No	No	No
keel	Yes	No	Yes	No

flying bird (noun)	keel (noun)
birds having keeled breastbones for attachment of flight muscles	one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability
	the median ridge on the breastbone of birds that fly
	a projection or ridge that suggests a keel

flying bird (verb)	keel (verb)
	walk as if unable to control one's movements