my @words = qw( SA NV LTD CO LLC );
my ($re) = map qr/$_/i, join '|', map quotemeta, @words;

while (<DATA>) {
  chomp;
  s/(?:\s*\b$re)+$//;
  print "[$_]\n";
}
__END__
Bobs leave SA Warehouse SA LTD
Jims Fine Wines CO LLC