avoirdupois vs avoirdupois weight

avoirdupois and avoirdupois weight both are nouns.

Word	Noun	Adjective	Verb	Adverb
avoirdupois	Yes	No	No	No
avoirdupois weight	Yes	No	No	No

As nouns, avoirdupois and avoirdupois weight are synonyms defined as:

avoirdupois and avoirdupois weight: a system of weights based on the 16-ounce pound (or 7,000 grains)

avoirdupois (noun)	avoirdupois weight (noun)
excess bodily weight	a system of weights based on the 16-ounce pound (or 7,000 grains)
a system of weights based on the 16-ounce pound (or 7,000 grains)