piece goods vs yard goods

piece goods and yard goods both are nouns.

Word	Noun	Adjective	Verb	Adverb
piece goods	Yes	No	No	No
yard goods	Yes	No	No	No

As nouns, piece goods and yard goods are synonyms defined as:

piece goods and yard goods: merchandise in the form of fabrics sold by the yard

piece goods (noun)	yard goods (noun)
merchandise in the form of fabrics sold by the yard	merchandise in the form of fabrics sold by the yard