There are a few different synonyms that could be used for the phrase "under nose." One option might be "in front of one's face," which refers to something that is very obvious or blatantly evident. Another synonym could be "within reach," meaning something that is close enough to easily grab or get to. A third possibility might be "on the tip of one's tongue," which refers to a word or idea that is just on the edge of being remembered or expressed. Other options might include "right under one's nose," "in plain sight," or "immediately noticeable." Ultimately, the choice of synonym will depend on the specific context and intended meaning.