adverb
Adverbial use emphasizing a large difference in degree or quality. Often used with comparatives or expressions of superiority.
彼の実力は他の選手より数等優れている。
His ability is far superior to that of the other players.
この問題は前のものより数等難
This problem is much more difficult than the previous one.
noun
a few levels; several grades
Noun use referring to a difference of several ranks, steps, or degrees. Less common than the adverbial use.
両者の間には数等の差がある。
There is a difference of several levels between the two.