The word "noticer" refers to someone who observes or pays attention to things that others might overlook. There are a variety of different synonyms that can be used to describe this kind of person, depending on the context and the level of specificity required. Some examples of synonyms for "noticer" might include "observer," "watcher," "surveyor," "inspector," or "examiner." Other possibilities might include more specialized terms like "scouter," "scout," "spotter," or "detector." Ultimately, the right synonym for "noticer" will depend on the particular nuance and connotations that are desired in a given situation.