plication vs pleat

plication and pleat both are nouns.

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

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

plication: an angular or rounded shape made by folding
pleat: any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape

Other hyponyms of plication include plait, kink, twirl, twist, pucker, ruck, accordion fold, concertina fold, z-fold, zig-zag fold.

plication (noun)	pleat (noun)
the act of folding in parallel folds	any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape
an angular or rounded shape made by folding

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