"Noodlehead" is a playful and sometimes endearing term used to describe someone who is scatterbrained or absent-minded. If you're searching for synonyms for this term, you may consider using words such as "scatterbrain," "space cadet," "daydreamer," "absent-minded," "scatterbrained," and "flighty." Additionally, you could use phrases such as "airhead," "thoughtless," "not all there," or "absent." It's important to note that someone who is described as a "noodlehead" is not necessarily unintelligent; rather, they may simply have a tendency to become easily distracted or forgetful.