What is another word for not this one?
Pronunciation: [nˌɒt ðˈɪswˌɒn] (IPA) 
There are several synonyms for the phrase "not this one." Some commonly used synonyms include "not the right one," "not the correct one," "not the suitable one," or "not the one I'm looking for." These phrases can be used in various situations, such as when looking for a specific item or object, or when choosing an option from a list. Other synonyms for "not this one" could include "not the one I want," "not the chosen one," or "not the desired option." Whatever synonym is used, it indicates that the item or option being referred to is not the one that is needed or desired.
