what do you call a group of people sharing the same language?

Question

How should I say that a group share the same language?

• chorus
• assemblage

Are there any other idioms, expressions or phrases that expresses the meaning?

Answer 1

"Ethnical groups" may be taken to refer to sets of individuals sharing a common language as well as common traditions or cultural heritage.

You could also use [language]-speaking group (and any other word: club/class/folk/etc.):

• English-speaking group
• Russian-speaking class
• Spanish-speaking folk

Answer 2

You would describe the group as being colingual, though "colingual" is not a commonly used word and is mainly used in academic settings. In everday English you would just say "[the group] share a common language"

Answer 3

The simplest is: [language] + speakers.

For example:

• English speakers
• Spanish speakers

Answer 4

They are native speakers of {language}

That phrase can be used in almost any context. It refers to those who have heard {language} being spoken since infancy and who have learned it as their first language.