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.
Coordinating conjunctions are small words that connect two or more grammatically equivalent words or phrases. The connected words might be adjectives, nouns, adverbs, verbs, or even independent clauses; the important thing is that they're equal and each one serves the same function in the sentence.
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The object pronoun le can be used impersonally to replace intangibles like adjectives, verbs, and clauses.
By definition, adjectives modify nouns. But more than 30 French adjectives can sometimes modify verbs instead, thus taking on the role and characteristics of adverbs, including the fact that they are invariable.