Step 1: Meaning of egoist.
An egoist is a person who is selfish and always thinks about themselves, giving importance only to their own interests.
Step 2: Analyzing options.
- Druggist: A person who sells medicines, not related.
- Lyricist: A person who writes song lyrics, not correct.
- Dramatist: A playwright or one who writes dramas, not correct.
- (Egoist: Correct, as it refers to a selfish person.
Step 3: Conclusion.
Therefore, the correct word for a selfish person is “egoist.”
Final Answer:
\[
\boxed{\text{(egoist}}
\]