The phrase "be a probability" means that something has a chance of happening or occurring. There are various synonyms that can be used in place of this phrase such as "be likely," "be possible," "be plausible," "be feasible," "be feasible," "be foreseeable," "be probable," or "be anticipated." Each of these synonyms can convey a slightly different nuance of certainty or expectation. For example, "be likely" suggests a stronger sense of probability than "be possible," while "be feasible" implies that a particular outcome is achievable. Overall, these synonyms offer versatile alternatives to express the concept of probability.