patella vs sesamoid

patella and sesamoid both are nouns.

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

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

patella: 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 patella include os sesamoideum, sesamoid bone.

patella (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