Crossword clue It could be

Dictionary of synonyms

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Synonym definitions

The word synonym refers to a word that has the same meaning as another word, or a meaning that is very close to that of the other word. Synonyms are different words that mean the same thing. When you use synonyms, the meaning of your phrase does not change.

Using synonyms

Synonyms and Opposites are used to:

Define a word. That's why they can be found in dictionary descriptions.
Avoid repetition in a piece of writing
Enrich your writing.

Examples of synonyms

The word bicycle can be considered a synonym of bike.
Dispute and altercation are words that are synonyms.
Loving and be in love are synonymous.
Anxiety and unease are two synonyms that can be found in this online dictionary of synonyms.

Using a dictionary of synonyms

The dictionary of synonyms enables users to find the most suitable terms for the context, rather than just those that first spring to mind. It also makes it possible to find terms that are better suited to describe a characteristic, purpose, or function of the thing, person, or action in question. Finally, the dictionary of synonyms helps writers to avoid repetition of words within the same piece of text, thereby improving their writing style.

Crossword clue it could be