• Dead languages
• Disappearing languages
• Foreign languages
• Indigenous languages
• International languages
• Modern languages
• Mother tongue
• National languages
• Sign languages
• Spoken language
• Uncommonly taught languages
• Unwritten languages
• Written language

• Comparative linguistics
• Computer languages
• Linguistics
• Signs

• Language types
• Language varieties
• Linguistic diversity

• Culture > Linguistics

http://vocabularies.unesco.org/thesaurus/concept308