astragal vs os

astragal and os both are nouns.

Word	Noun	Adjective	Verb	Adverb
astragal	Yes	No	No	No
os	Yes	No	No	No

As nouns, os is a hypernym of astragal; that is, os is a word with a broader meaning than astragal:

astragal: the bone in the ankle that articulates with the leg bones to form the ankle joint
os: rigid connective tissue that makes up the skeleton of vertebrates

Other hypernyms of astragal include bone.

astragal (noun)	os (noun)
a beaded molding for edging or decorating furniture	rigid connective tissue that makes up the skeleton of vertebrates
the bone in the ankle that articulates with the leg bones to form the ankle joint	a mouth or mouthlike opening