ou or ow for the sound in cow

When does the rule apply?

This rule is a little messier than ai and ay, because ow has a second job: before a final n or l, it beats ou (brown, howl). Ou never ends a common word. Remember that ow also spells long o (snow, grow), and ou spells other sounds too (soup, touch). Our tables include only words where the letters spell the sound in "cow", so every example can be trusted.

Words that follow the rule

Words that break the rule

How do you teach it?

Teach this after students read both spellings. Start with the end-of-word cases, which almost never fail: cow, how, now, plow. Then add ow before n or l with clown, frown and growl. Finish with ou in the middle: mouth, round, shout.

"Spell 'scowl'. The sound comes right before a final l, so we can use ow: s-c-o-w-l. Now 'south'. After the vowel comes /th/. That's not n or l, so it's ou: s-o-u-t-h."

What is the common error, and the fix?

Students write "cou" for cow and "clowd" for cloud. The first breaks the firm part of the rule: ou does not end a word. The second is the gray area, so check the letter after the sound. Only a final n or l lets ow into the middle of a one-syllable word.

Sort it: a hands-on activity

Mix cards for ou and ow words with four ow cards that say long o (snow, blow, grow, show). Students sort by sound first, then by spelling and position. The long o cards are a reminder to read the word before deciding.

How this list was built