The noun 'Mr. Johnson' is a proper noun, the name of a specific person.
A common noun is a general word for a person, a place, or a thing.
Examples of common nouns for 'Mr. Johnson' are:
give example of common classification
give an example of two fractions whose product equals 1
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give me example of same pronounce but different meaning
give me some example of porifera a natural or "kitchen" or "bath" sponge
Give an example of a situation where you had to work with others to achieve a common goal and how you achieved this
The common folk revolted against the imperialism of the monarch.
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The common noun for "Shopwise Supermarket" is "supermarket." A common noun refers to a general category or type of thing, as opposed to a specific name. For example, in a sentence, you might say, "I went to the supermarket to buy groceries," where "supermarket" is the common noun.
Give us this day our daily bread.
Things like spoons, forks, chairs, napkins, lights, etc.