"Be plentiful in" is a phrase commonly used to describe an abundance or surplus of something. However, there are several synonyms that can be used to convey the same meaning, such as "be abundant in," "be plentiful with," "be copious in," "be rich in," and "be rife with." These phrases can be used to describe a variety of things, including resources, opportunities, ideas, and emotions. In addition to these synonyms, there are also numerous idiomatic expressions that convey the same idea, such as "in full swing," "in great abundance," "overflowing with," and "teeming with." By using these synonyms and expressions, you can add variety to your language and capture the full richness of your descriptions.