troy vs troy weight

troy and troy weight both are nouns.

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

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

troy and troy weight: a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains

troy (noun)	troy weight (noun)
a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains	a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains