Closed book and Rune

Closed book noun - Something hard to understand or explain.

Rune and closed book are semantically related in puzzle topic. In some cases you can use "Rune" instead a noun phrase "Closed book", when it comes to topics like mystery.

Rune noun - A composition using rhythm and often rhyme to create a lyrical effect.

Closed book and rune are semantically related in puzzle topic. Sometimes you can use "Closed book" instead a noun "Rune", if it concerns topics such as mystery.

Nearby Word: runic