What's the plural form of flirtationship? Here's the word you're looking for.
Answer
The noun flirtationship can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be flirtationship.
However, in more specific contexts, the plural form can also be flirtationships e.g. in reference to various types of flirtationships
or a collection of flirtationships.