Common, ordinary, familiar, popular, vulgar are comparable when they mean being or having the character of what is generally or usually met with and not in any way special, strange, or unusual.
Common implies the lack of distinguishing, conspicuous, or exceptional qualities; positively, it suggests usualness, everyday character or quality, or frequency of occurrence. Often the term also connotes inferiority, coarseness, lack of breeding, or low station.
Ordinary expresses more definitely accordance with the regular order or run of things. It usually implies qualities not above, and frequently below, the average. As a term of depreciation ordinary is similar to but less contemptuous than common.
Familiar stresses something that is generally known and easily recognized because of its frequency of occurrence or one’s constant association with it rather than because of its lack of distinguishing qualities.
Popular and vulgar (see also COARSE) imply commonness that arises from use or acceptance by or prevalence among the vast majority of persons, often specifically among the common people of a country or an age.