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I guess one could figure out this fairly quickly:

1) Download a suitable list of ICAO codes that also has one or even more names for the city or other location the airport is in or mostly used by
2) Keep just those where one of those names is four letters long
3) See if any of those match the ICAO code

And the winner is:

#Niue International Airport, #ICAO code: NIUE.

Found using the list from https://datahub.io/core/airport-codes and this Perl code:

#!/usr/bin/env perl -an -F,

use strict;

my $icao = $F[0];

next unless $icao =~ m/[A-Z][A-Z][A-Z][A-Z]/;

foreach my $name(split(/ /,$F[2].' '.$F[7])) {
if (uc($icao) eq uc($name)) {
print $icao, ' ', $F[2], ' ', $F[7], "\n";
}
}

Ignoring two matches with bogus data: BOBS and SWYX.

IATA check left as an exercise to readers.

(I hadn't written any Perl in many years, but still it seemed like the natural language to use. But most people would probably have used Python, sure. Left as an exercise.)