French compound nouns are made up of two or more words, often connected by hyphens. Making them plural can be a little tricky, but there are two rules that generally apply.
Magnetic poetry is a fun little tool you can use to learn and practice French. 500 magnets with words and parts of words help you to express yourself in a unique and creative way.
Most French nouns and adjectives become plural with the addition of s, but of course there are exceptions.