The phrase "say loudly" can be expressed in a variety of ways. Some synonyms include "shout," "yell," "scream," "bellow," "roar," "holler," and "holler out." These words all convey a sense of volume and forcefulness, emphasizing that the speaker is trying to be heard. Other options might be "declare," "pronounce," "announce," or "proclaim." While not necessarily implying a specific volume, these words still carry a sense of intentionality and conviction. Overall, there are many ways to convey the idea of speaking loudly, depending on the specific context and tone of the communication.