Answer:
jockey
Explanation:
A domain word is a technical term that is unique to a particular field.
The answer is "A". As benefitial means good or well
First off we have the same name.
But I will answer your question if you answer mine. Do you mean to write a letter for teens to read (hypothetically)? As in " Dear teens, You need to take a look in the mirror and note all of the good things about yourself......"?
The common synonyms are usually unknown, uncertain, unclear, etc.