The phrase "come before" can be used in various contexts, such as to refer to priority, precedence or submission. When it comes to synonyms for this expression, several options are available, including precede, antecede, outrank, take precedence, come first or lead the way. Each of these alternatives can be employed depending on the intended meaning, but they all capture the idea of something preceding or coming first in importance or sequence. Overall, the choice of synonym would depend on the context in which it is being used and the desired connotation or emphasis.