What is the common word for

Assistant

The word "common" can be used in a variety of contexts, but it often refers to something that is shared by a group of people or things. For example, in the phrase "common sense," the word "common" means that the sense in question is one that is shared by most people. In the phrase "common denominator," the word "common" means that the denominator in question is one that is shared by two or more fractions.

In this case, the phrase "common word" most likely refers to a word that is shared by a group of languages. For example, the word "dog" is a common word because it is used in many different languages to refer to the same animal.