KLANKWOORDEN (sound words) are words with (a combination) of fixed letter(s) that present a distinctive pronunciation.

There are the words with a short sound , like VIS (fish) and POP (doll), words with an combination of -NG or -NK, like LANG (long) and KLANK (Sound), woorden met -SCH like SCHIP (boat) and SCHEREN (shaving), words with -CHT like LICHT (light) or words with two-character sounds, like KOEK (cookie), THUIS (at home) or KEUKEN (kitchen).