diam vs caliber

diam and caliber both are nouns.

Word	Noun	Adjective	Verb	Adverb
diam	Yes	No	No	No
caliber	Yes	No	No	No

As nouns, caliber is a hyponym of diam; that is, caliber is a word with a more specific, narrower meaning than diam:

diam: the length of a straight line passing through the center of a circle and connecting two points on the circumference
caliber: diameter of a tube or gun barrel

Other hyponyms of diam include bore, calibre, gauge, windage.

diam (noun)	caliber (noun)
the length of a straight line passing through the center of a circle and connecting two points on the circumference	a degree or grade of excellence or worth
	diameter of a tube or gun barrel