calibre vs high quality

calibre and high quality both are nouns.

Word	Noun	Adjective	Verb	Adverb
calibre	Yes	No	No	No
high quality	Yes	No	No	No

As nouns, high quality is a hyponym of calibre; that is, high quality is a word with a more specific, narrower meaning than calibre:

Other hyponyms of calibre include superiority, inferiority, low quality.

calibre (noun)	high quality (noun)
a degree or grade of excellence or worth	the quality of being superior
diameter of a tube or gun barrel