pleat vs knife pleat

pleat and knife pleat both are nouns.

Word	Noun	Adjective	Verb	Adverb
pleat	Yes	No	Yes	No
knife pleat	Yes	No	No	No

As nouns, knife pleat is a hyponym of pleat; that is, knife pleat is a word with a more specific, narrower meaning than pleat:

pleat: any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape
knife pleat: a single pleat turned in one direction

Other hyponyms of pleat include box pleat, inverted pleat, kick pleat, tuck.

pleat (noun)	knife pleat (noun)
any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape	a single pleat turned in one direction

pleat (verb)	knife pleat (verb)
pleat or gather into a ruffle
fold into pleats