wicker vs piece of work

wicker and piece of work both are nouns.

Word	Noun	Adjective	Verb	Adverb
wicker	Yes	No	No	No
piece of work	Yes	No	No	No

As nouns, piece of work is a hypernym of wicker; that is, piece of work is a word with a broader meaning than wicker:

wicker: work made of interlaced slender branches (especially willow branches)
piece of work: a product produced or accomplished through the effort or activity or agency of a person or thing

Other hypernyms of wicker include work.

wicker (noun)	piece of work (noun)
work made of interlaced slender branches (especially willow branches)	a product produced or accomplished through the effort or activity or agency of a person or thing
slender flexible branches or twigs (especially of willow or some canes); used for wickerwork