banding vs cap band

banding and cap band both are nouns.

Word	Noun	Adjective	Verb	Adverb
banding	Yes	No	No	No
cap band	Yes	No	No	No

As nouns, cap band is a hyponym of banding; that is, cap band is a word with a more specific, narrower meaning than banding:

banding: an adornment consisting of a strip of a contrasting color or material
cap band: a band that goes around the headgear of the armed forces, typically having a dark, contrasting color, often black, but may be patterned or striped.

Other hyponyms of banding include cigar band, hatband, neckband, pinstripe.

banding (noun)	cap band (noun)
an adornment consisting of a strip of a contrasting color or material	a band that goes around the headgear of the armed forces, typically having a dark, contrasting color, often black, but may be patterned or striped.
a stripe or stripes of contrasting color