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4. Jawaharlal Nehru is elected prime minister
1. A conflict breaks out at the Sikh Golden Temple
3. India gain independence
2. Indira Gandhi is assassinated
A thesaurus does not discriminate words of certain origin (so foreign or non-foreign) and neither does it specialist in some parts of speech (so not in adjectives).
the correct answer is synonyms: it is a dictionary that groups synonyms together.