At the same time, Forth ties one to a model of programming pretty tightly (although writing an interpreter or translator in Forth isn't that complicated). Lisp has that drawback, too, though. Perl does not.
I don't necessarily consider that a benefit for what's intended as a first language, though. On the contrary, it tends to cause a lot of confusion.
However, I'm not convinced that binding so tightly to a single model is a benefit, either. Which is why I'd tend to suggest Ruby rather than Lisp.
"There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.