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I've included a couple of links which should explain better the differences among the four levels of measurement: Nominal, Ordinal, Interval and Ratio. The nominal level can be thought of as the "name" level.
I'll give you an example of nominal level of measurement. Perhaps you are collecting data on the types of cars that go through an intersection. You classify the vehicles passing by as trucks, cars and motorcycles and count how many of each pass by.
Ordinal is the "order" level, where some natural order of data is possible. The difference between measurements has no physical meaning.
An example of ordinal level of measurement. A hospital asks in the emergency room, for patients to describe their pain on a level of 1 to 10, which 10 being the most severe.
As given in the first link, it is interesting that there is not complete agreement on this system of classification.
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Is age nominal or ordinal?
Ordinal. Though more likely interval or even ratio scale.
What is Gingival Index is it ordinal nominal ratio or integer?
It is an ordinal since gingival index uses 0-3 scale
How many different levels of measurement for variables exist?
Nominal or category;Ordinal scale;Interval scale; andRatio scale.
What are the scale or levels of measurements?
Nominal, ordinal, interval and ratio. Please see the link.
What is ordinal and nominal scale?
A nominal scale is one in which the data are categoric, for example, pet animal, town, colour of eyes. There is no order in the categories. A dog is not "more" or less than a "cat". An ordinal scale in which there is an implied ordering but this is based on an arbitrary scale. The difference between a pair of adjacent categories may or may not be related to the difference between another pair. Typical survey questionnaires with answers categorised as: "strongly disagree, disagree, neither, agree, strongly agree".
