The phrase "for second" can be replaced with a number of synonyms to convey the same meaning in different ways. "In the runner-up position" is a common phrase used to describe being second place in a competition or race. "Next in line" can also convey the idea of being second, often used in a context of succession or hierarchy. "Secondary" or "subordinate" are synonyms that can apply to being second in importance or status. Other synonyms for "for second" could include "as a follow-up," "in addition," or "as an alternative option." Each of these phrases provides a slightly different nuance to the meaning of being "for second".