Look at how these nouns ending in -ou change in the plural form:
Note that as a rule, nouns in -ou take an -s in the plural form, except for 7 exceptions, which take an -x:
| le bijou | les bijoux | jewel(s) |
| le chou | les choux | cabbage(s) |
| le caillou | les cailloux | stone(s) |
| le joujou | les joujoux | toy(s) |
| le genou | les genoux | knee(s) |
| le pou | les poux | lice |
| le hibou | les hiboux | owl(s) |
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Examples and resources
"Les pluriel des noms" by youlearnfrench.blogspot.com