Mushroomed is a common term used to describe something that has rapidly increased in size or quantity, much like the growth of a mushroom. But there are many other synonyms that can be used to describe this phenomenon. For example, the word "proliferated" can be used to describe an increase in numbers or growth. "Blossomed" can be used to describe a sudden and rapid emergence of something new. "Flourished" is another term often used to describe something that has grown and developed over time. Whether it's mushrooms or ideas, there are many words to describe growth and expansion, each with their own unique connotations.