kneecap vs sesamoid

kneecap and sesamoid both are nouns.

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

As nouns, sesamoid is a hypernym of kneecap; that is, sesamoid is a word with a broader meaning than kneecap:

kneecap: a small flat triangular bone in front of the knee that protects the knee joint
sesamoid: any of several small round bones formed in a tendon where it passes over a joint

Other hypernyms of kneecap include os sesamoideum, sesamoid bone.

kneecap (noun)	sesamoid (noun)
a small flat triangular bone in front of the knee that protects the knee joint	any of several small round bones formed in a tendon where it passes over a joint

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