Average
Part of speech: noun
Definition: The arithmetic mean. Any measure of central tendency, especially any mean, the median, or the mode (see Usage notes below). An indication of a player's ability calculated from his scoring record, etc.
Part of speech: adjective
Definition: Constituting or relating to the average. Neither very good nor very bad; rated somewhere in the middle of all others in the same category. Typical. Bad or undesirable.
Part of speech: verb
Definition: To compute the arithmetic mean of. Over a period of time or across members of a population, to have or generate a mean value of.
Example sentence: The average dog is a nicer person than the average person.
Common
Part of speech: noun
Definition: Mutual good, shared by more than one.A tract of land in common ownership; common land.
Part of speech: adjective
Definition: Mutual; shared by more than one.Occurring or happening regularly or frequently; usual.Found in large numbers or in a large quantity.Simple, ordinary or vulgar.In some languages, particularly Germanic languages, of the gender originating from the coalescence of the masculine and feminine categories of nouns.Of or pertaining to uncapitalized nouns in English, i.e., common nouns vs. proper nounsvernacular, referring to the name of a kind of plant or animal, i.e., common name vs. scientific name