Proliferous is a word that describes something that is producing or multiplying rapidly. Some synonyms for the word proliferous include: abundant, copious, flourishing, fruitful, productive, prolific, and teeming. These words all convey a sense of growth, expansion, and abundance. For instance, when we say something is copious, we mean that it is present in large amounts. When we describe a person as being prolific, we are suggesting that they are skilled at producing new work. Whatever the context, these synonyms for proliferous give us an idea of something that is thriving and expanding, whether this refers to a physical object, a biological organism, or an artistic output.