[arb]

The nomenclature goes something like this. The common noun "lisp" refers to the family of languages; the proper noun "Lisp" refers to Common Lisp; and "LISP" refers to obsolete lisp dialects from long before Lisp's time.

Generally, lisps are not necessarily functional, though some dialects are, to varying degrees. Common Lisp isn't very functional at all; Scheme is much more functional; and Clojure is quite strongly functional.