#!/usr/bin/perl
use strict;
use warnings;

my @ignore_list = (
    qr/^\Qwords\:\:moreWords_\E\d+/i,
    qr/^[^:]+$/
);

local $" = '|';
while (<DATA>) {
    print unless /@ignore_list/;
}

__DATA__
words\:\:moreWords_68
words\:\:moreWords_92
words\:\:fewerWords_92
words\:\:moreWords_a7
birds\:\:moreWords_68
item