The earlier classes zahir, nass, mufassar and muhkam measure degrees of clarity. The present classes ask through which relationship the text indicates a legal meaning.
The same expression can be described on both axes. A ruling may be reached through ibarat while the relevant wording is also classified as zahir or nass in the earlier technical sense.
In this division, “nass” commonly refers to the revealed wording under discussion, not exclusively to one rank of clarity.