kneepan vs kneecap

kneepan and kneecap both are nouns.

Word	Noun	Adjective	Verb	Adverb
kneepan	Yes	No	No	No
kneecap	Yes	No	Yes	No

As nouns, kneepan and kneecap are synonyms defined as:

kneepan and kneecap: a small flat triangular bone in front of the knee that protects the knee joint

Other synonyms of kneepan include patella.

kneepan (noun)	kneecap (noun)
a small flat triangular bone in front of the knee that protects the knee joint	a small flat triangular bone in front of the knee that protects the knee joint

kneepan (verb)	kneecap (verb)
	shoot in the kneecap, often done by terrorist groups as a warning