The difference between solipsism and narcissist
is that “solipsism” is the theory that the self is all that exists or that can be proven to exist and “narcissist” is one who shows extreme love and admiration for themselves.
The difference between narcissist and gaslighter
is that "narcissist" is one who shows extreme love and admiration for themselves and "gaslighter" is one who, or that which, lights gas.
The difference between narcissist and selfish
is that "narcissist" is one who shows extreme love and admiration for themselves and "selfish" is holding one’s own self-interest as the standard for decision making.