Solutions "... language is never invented": Tolkien has 4 entries with similar clues

• 4-letter words
• enyaartist who has recorded in tolkien's fictional language
• 6-letter words
• anduinIn J R R Tolkien's The Lord of the Rings , the great river, east of the Misty Mountains, on whose west bank is the Elvish land of Lothlorien
• hobbitMythological creature devised by JRR Tolkien
• 7-letter words
• gandalfTolkien character