.22-caliber vs .22 caliber

.22-caliber and .22 caliber both are adjectives.

Word	Noun	Adjective	Verb	Adverb
.22-caliber	No	Yes	No	No
.22 caliber	No	Yes	No	No

As adjectives, .22-caliber and .22 caliber are synonyms defined as:

.22-caliber and .22 caliber: of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter

Other synonyms of .22-caliber include .22-calibre, .22 calibre.

.22-caliber (adjective)	.22 caliber (adjective)
of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter	of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter