The most appropriate word which means the same as the group of words given is acronym.
- Acronym is a word formed from the initial letters of other words.
- Homonym is a word that has the same sound as another word but has a different meaning.
- Pseudonym is a false name used by an author or other person.
- Toponym is a place name.
The word acronym is the most appropriate because it specifically refers to a word that is formed from the initial letters of other words.
For example
RADAR (Radio Detection and Ranging) | 
