plait vs box pleat

plait and box pleat both are nouns.

Word	Noun	Adjective	Verb	Adverb
plait	Yes	No	Yes	No
box pleat	Yes	No	No	No

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

plait: any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape
box pleat: a flat double pleat made by folding under the fabric on either side of it

Other hyponyms of plait include inverted pleat, kick pleat, knife pleat, tuck.

plait (noun)	box pleat (noun)
any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape	a flat double pleat made by folding under the fabric on either side of it
a hairdo formed by braiding or twisting the hair

plait (verb)	box pleat (verb)
weave into plaits
make by braiding or interlacing