fin keel vs keel

fin keel and keel both are nouns.

Word	Noun	Adjective	Verb	Adverb
fin keel	Yes	No	No	No
keel	Yes	No	Yes	No

fin keel (noun)	keel (noun)
a metal plate projecting from the keel of a shallow vessel to give it greater lateral stability	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

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