A Book That Lists Words as Groups of Synonyms

This page is the CodyCross answer for the clue below from Space Exploration, Group 913, Puzzle 4 (Heliopause).

Question is: A Book That Lists Words as Groups of Synonyms

and the answer is: THESAURUS

Word Meaning:

THESAURUS — A publication that provides synonyms (and sometimes antonyms and other semantic relations) for the words of a given language.

Definitions from Wiktionary.

A Book That Lists Words As Groups Of Synonyms - Space Exploration CodyCross Answers | CodyCross Solutions