The term "in applicability" refers to whether something is relevant or appropriate in a particular context or situation. There are several synonyms that can be used in place of "in applicability", including "suitability", "relevancy", "pertinence", "applicableness", and "appropriateness". These words are all related to the concept of whether something is suitable or appropriate for a specific purpose or situation. For example, if discussing whether a particular law applies to a specific case, one might use synonyms such as "pertinence" or "applicableness". Using synonyms can help to clarify the meaning of a particular statement or argument and can help to avoid repetition in language.