When you want to describe something that is easily noticeable or conspicuous, there are various synonyms that you can use for the word "noticeableness". For instance, you can use the word "prominence" when you want to describe something that stands out or catches the eye easily. Another synonym is "distinctiveness", which refers to the quality of being easily distinguishable from others. "Visibility" is also an appropriate synonym to use when you want to express how easy it is to notice something. Other synonyms for "noticeableness" include "conspicuousness", "salience", "markedness", and "obviousness". Regardless of the synonym you choose to use, the idea is to convey that something is easily noticeable or stands out from its surroundings.