I'd argue that Lisp has a syntax in that you do need at least a context-free grammar to describe valid Lisp programs. With Forth, on the other hand, while ther

I'd argue that Lisp has a syntax in that you do need at least a context-free grammar to describe valid Lisp programs. With Forth, on the other hand, while there is a rule for deciding when one word ends and another ends, and how to interpret literals, I think that, for all practical purposes, there aren't actually any strings that are syntactically invalid. As the ANSI Forth standard puts it: > This Standard does not require a syntax or program-construct checker. (page 33)