As nouns the difference between cupro and lyocell
is that cupro is rayon made by the cuproammonium process while lyocell is a semisynthetic fibre (and associated fabric) made from wood pulp.
cupro
English
Noun
(-)
rayon made by the cuproammonium process
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lyocell
English
Noun
(-)
A semisynthetic fibre (and associated fabric) made from wood pulp