* PARSE-WORD ( "chars" -- c-addr u )

the ANS'94 standard describes this word in a comment
under >PARSE, section A.6.2.2008 - quote:

Skip leading spaces and parse name delimited by a space. c-addr
is the address within the input buffer and u is the length of the
selected string. If the parse area is empty, the resulting string
has a zero length.

If both >PARSE and >PARSE-WORD are present, the need for >WORD is
largely eliminated.

core ordinary primitive