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Hello Jayant, I'm afraid I'm not sure what you mean. Are you asking about the meaning of the word 'synonyms'? If so, then any online dictionary will be of use: https://dictionary.cambridge.org/dictionary/english/synonym ~ If you are asking about where to find lists of synonyms, then a thesaurus is a good source, though it only lists words with similar meanings and does not deal with the differences between them: https://www.merriam-webster.com/thesaurus/big ~ We do not have pages specifically focusing on synonyms on the site, but many of the tasks we use include words with similar meanings, such as the fourth task here: https://learnenglish.britishcouncil.org/britain-great/knowledge-great-part-2 ~ Peter The LearnEnglish Team

Hello Imran 26, I'm afraid there's no clear answer to this as it depends on what the person needs to communicate, with whom and in what circumstances. For very simple communication a very basic range of words and phrases is all that is needed. For more nuanced expression you need a broader range. If style and giving a good impression is important then a broader range still is necessary. ~ Peter The LearnEnglish Team