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.