diam vs calibre

diam and calibre both are nouns.

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

As nouns, calibre is a hyponym of diam; that is, calibre 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
calibre: diameter of a tube or gun barrel

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

diam (noun)	calibre (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