.38-caliber vs .38 caliber

.38-caliber and .38 caliber both are adjectives.

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

As adjectives, .38-caliber and .38 caliber are synonyms defined as:

.38-caliber and .38 caliber: of or relating to the bore of a gun (or its ammunition) that measures thirty-eight hundredths of an inch in diameter

Other synonyms of .38-caliber include .38-calibre, .38 calibre.

.38-caliber (adjective)	.38 caliber (adjective)
of or relating to the bore of a gun (or its ammunition) that measures thirty-eight hundredths of an inch in diameter	of or relating to the bore of a gun (or its ammunition) that measures thirty-eight hundredths of an inch in diameter