Most Common Lisp folks have hijacked the word "Lisp" to mean Common Lisp.
Then you have Lisp-1 and Lisp-2 definitions, so when you say "a Lisp" people will wonder which you fall into, and it'll be one of the first asked questions.
Depending on your audience, they may have a very fixed idea what "Lisp" means, and it may be a very detailed concept.
> Isn't Lisp just the same?
Not really.
Most Common Lisp folks have hijacked the word "Lisp" to mean Common Lisp.
Then you have Lisp-1 and Lisp-2 definitions, so when you say "a Lisp" people will wonder which you fall into, and it'll be one of the first asked questions.
Depending on your audience, they may have a very fixed idea what "Lisp" means, and it may be a very detailed concept.
Forths don't tend to suffer from those problems.