Expanse is a related term of copiousness.
As nouns the difference between expanse and copiousness
is that expanse is a wide stretch, usually of sea, sky, or land while copiousness is the state of being copious.
expanse
English
Noun
(
en noun)
A wide stretch, usually of sea, sky, or land.
*'>citation
An amount of spread or stretch.
Related terms
* expand
* expansion
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copiousness
English
Noun
(-)
The state of being copious