Thesaurus

A thesaurus is a special type of dictionary, dedicated to synonyms and antonyms. A good example of an online thesaurus is here. Thesauri are useful tools when you want to avoid overusing the same word, and seek for suitable synonyms, thus helping you write a richer text, with a wider range of lexicon. Similarly, they can help you find an antonym for that word. Even though it is not their specialization, a thesaurus can also give you a brief definition of the word.

For this blog post, I've looked up the word EXAMPLE, because it's a word very often used by teachers and students alike, thus making it an appropriate example (pun intended):

As you can see, there is a list of synonyms underneath the word, all of them colour-coded to indicate the degree of similarity, ranging from the most similar (most saturated colour) to the least (palest colour). There is also a tool which allows you to highlight synonyms by their lenght.

https://www.thesaurus.com/browse/example

Apart from the colour-coded list, this website offers additional resources. Further down on that page there are synonyms of EXAMPLE for particular applications, and those synonyms have in turn their own lists of synonyms.