Some words click and others moan

‘We must remember how wide the word “Iowa” is. We must bear in mind how some words are closed at both ends like “top” or are as open as “easy” or as huffed as “hush.” Some words click and others moan. Some grumble. Listen to the way the word “sister” is put together. Can you feel the blow which chops off the end of “clock”?’ – William Gass