It worked fine but yes there was an empty file named 1.

If I change it to the following it should work as I meant it to:

open (my $fh, "<", $ARGV[0]) or die "Can't open input file!";
my @words;
while (<>) {
    push(@words, $_);
}
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Better, but not yet correct: you should tell Perl which file handle to read from:

while (<$fh>) {
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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

open (my $fh, "<", $ARGV[0]) or die "Can't open input file!";
my @words;
  ### The above die function should also return OS_ERROR if open funct
+ion failed
  ###  ... die "can't open file: $!";
while (<>) {
  ### <> will read from the STDIN not the filehandler $fh
  ### so that should be while(<$fh>){...}
    push(@words, $_);
}
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So if I put in while (<$fh>) it breaks my my $guess = <> further down in my code. I made that my $guess = <STDIN> and it works fine.