Is there a classification for words combined with hyphens used as adjectives?

Question

Is there a term or classification for words (non-adjectives, for lack of a better classifier) that are combined with hyphens that serve the purpose of an adjective? For example, "run-of-the-mill applicant" or "less-than-ideal scenario." Are there any specific rules that dictate how these word groupings are handled?

Answer 1

They are called compound adjectives. You will find an overview with some rules and examples on Wikipedia. Note that you should normally use hyphens ( - ), not dashes ( – or — ) in compound adjectives.