quality vs caliber

quality and caliber both are nouns.

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

As nouns, quality and caliber are synonyms defined as:

Other synonyms of quality include calibre.

quality (noun)	caliber (noun)
an essential and distinguishing attribute of something or someone	a degree or grade of excellence or worth
(music) the distinctive property of a complex sound (a voice or noise or musical sound)	diameter of a tube or gun barrel
a degree or grade of excellence or worth
a characteristic property that defines the apparent individual nature of something
high social status

quality (adjective)	caliber (adjective)
of superior grade
of high social status