manubrium vs os

manubrium and os both are nouns.

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

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

Other hypernyms of manubrium include bone.

manubrium (noun)	os (noun)
the upper part of the breastbone	rigid connective tissue that makes up the skeleton of vertebrates
	a mouth or mouthlike opening