Language and Set phrase

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

Set phrase and language are semantically related In some cases you can use "Set phrase" instead a noun "Language".

Set phrase noun - An expression whose meanings cannot be inferred from the meanings of the words that make it up.

Language and set phrase are semantically related in idiom topic. You can use "Language" instead a noun phrase "Set phrase", if it concerns topics such as expression, turn of phrase, verbalization.