As I like to say, Forth is the dual of Lisp. They reach the same goal (a programmable programming language) through completely different and complementary methods.
It'd be glib to say that Smalltalk is a Lisp, but Smalltalk's ideas are similar enough to Lisp's that I would put it squarely in the "Lisp camp". The same is true of things like Ruby, about which people have been glib enough to say it's an "acceptable Lisp".
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As I like to say, Forth is the dual of Lisp. They reach the same goal (a programmable programming language) through completely different and complementary methods.
What would it be called if we add Smalltalk there, as a third option? A "trial"? No wait, that can't be right.
It'd be glib to say that Smalltalk is a Lisp, but Smalltalk's ideas are similar enough to Lisp's that I would put it squarely in the "Lisp camp". The same is true of things like Ruby, about which people have been glib enough to say it's an "acceptable Lisp".