Numerousness is a synonym of manyness.
As nouns the difference between numerousness and manyness
is that numerousness is the state or quality of being numerous while manyness is the quality or state of being many.
numerousness
English
Noun
(-)
the state or quality of being numerous
manyness
English
Noun
(-)
The quality or state of being many.
Synonyms
* multiplicity
* numerousness
Antonyms
* oneness
* singleness
See also
* cardinality
* muchness