Definitions for "Nominal data"
Simple data that provides only qualitative differences. There is no ranking and data is classified without hierarchy. Examples of maps containing this class of data would show the location of different types of soil, vegetation or employment.
Data described by a value that assigns it to a category, but does not provide for a ranking or ordering of the values.
data in which the question responses can't be ordered, i.e., where one can't say that one response is more or less than another response, for example, the city in which the respondent lives.