There are a variety of synonyms that can be used in place of "be abundant in," depending on the context and tone. Some possible options include "abound with," "overflow with," "teem with," "be filled with," "be rich in," "be plentiful in," "be rife with," "be awash in," "be saturated with," and "be loaded with." Each of these phrases conveys a similar sense of abundance and plenty, but may evoke slightly different connotations or nuances. Experimenting with different synonyms can help to vary your writing style and keep your language fresh and engaging.