Odpowiedzi:
dwusuwa słowo, a to, co stanowi słowo, jest określone przez iskeywordustawienie. Od :h word:
word
A word consists of a sequence of letters, digits and underscores, or a
sequence of other non-blank characters, separated with white space (spaces,
tabs, <EOL>). This can be changed with the 'iskeyword' option. An empty line
is also considered to be a word.
Aby usunąć _z iskeyword:
set iskeyword-=_
*/ #zniknął.