Nous avons deux lave-linge et trois taille-crayons.

From Lesson 440:Plural compound nouns·French

Questions & Answers about Nous avons deux lave-linge et trois taille-crayons.

Why doesn't lave-linge take an -s at the end for the plural?
In compound nouns made of a verb (lave) and a noun (linge), the verb part never changes. Under traditional French rules, the noun part only takes an -s if the logic of the word implies a plural. Since a washing machine washes laundry in general (le linge, an uncountable mass noun), linge remains singular even when you have deux lave-linge.
Why does taille-crayons get an -s then?
It follows the exact same traditional rule! A pencil sharpener is designed to sharpen multiple pencils (des crayons). Because the noun logically represents a plural idea, it takes an -s when the compound noun itself is pluralized.
Would it be un taille-crayons with an -s if I only had one pencil sharpener?
Traditionally, no. It is written un taille-crayon in the singular. The plural logic for the pencils kicks in when the item itself is pluralized into des taille-crayons. However, you should know that a 1990 spelling reform tried to simplify all of this: under the newer rules, all verb-noun compounds simply take an -s in the plural and no -s in the singular. The sentence here uses the traditional spelling, which is still widely taught and used.
Are compound nouns for tools always formed with a verb and a noun?
Not always, but it is an extremely common pattern for naming tools, gadgets, and machines in French. They are almost always hyphenated. Other everyday examples you will encounter include un tire-bouchon (a corkscrew), un grille-pain (a toaster), and un sèche-cheveux (a hair dryer).

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