Indo-European language and Tongue

Indo-European language noun - The family of languages that by 1000 BC were spoken throughout Europe and in parts of southwestern and southern Asia.

Tongue and Indo-European language are semantically related. In some cases you can use "Tongue" instead a noun phrase "Indo-European language".

Tongue noun - The stock of words, pronunciation, and grammar used by a people as their basic means of communication.

Indo-European language and tongue are semantically related. Sometimes you can replace phrase "Indo-European language" with "Tongue", this terms are similar.