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nawk 'FNR==NR{a[$1];next}{for(i in a) print i, $2}' myFile myFile

If you're on Solaris, use nawk or /usr/xpg4/bin/awk:

awk 'END {
for (i = 0; ++i <= NF;)
printf "%s", (m[i] (i < NF ? FS : RS))
}
{
for (i = 0; ++i <= NF;)
$i > m[i] && m[i] =...

It probably does need some explination.

Consider the following input
The quick brown fox jumped over the lazy
brown fox.

It produces to 2 arrays from this g is a global word count:...

Well spotted - my test data didn't have a line with zero count, fixed below.
Also matches words regardless of their case and removes common punctuantion (eg comma, full stop, semi-colon, colon,...

I did not run the code, only skimmed it, but it seems to me that if a word that meets the frequency threshold does not occur in a line, the printf statement will not print a 0. I'm assuming a 0...

Thanks Chubler_XL, based on your note, I have my code a little change to be more robust,
awk 'NR==FNR{for(i=1;i<=NF;i++) {a[$i]++}}
NR>FNR&&FNR==1{for(i in a) {if( a[i]>=1) b[j++]=i;printf i "...