Choose the one which can be substituted for the given sentence.
A word formed from the initial letters of a name

Correct option is C

The correct one-word for the given group of words is (c) Acronym.
Explanation: An acronym is a word created from the initial letters of a phrase/name and pronounced as a word (e.g., NATO, UNICEF) (Hindi: संक्षिप्त रूप/आद्याक्षरी शब्द). It compresses multi-word names into a single pronounceable unit for ease of reference.
Example: “ISRO” is an acronym for Indian Space Research Organisation.
Meanings of the given other options:
• (a) Pseudonym: A fictitious name used by a person, especially an author; pen name (Hindi: छद्म नाम/कलम नाम).
• (b) Homonym: A word that shares the same spelling or pronunciation with another but has a different meaning (Hindi: समनाम).
• (d) Antonym: A word opposite in meaning to another (Hindi: विलोम शब्द).