What's the plural form of kinsmanship? Here's the word you're looking for.
Answer
The noun kinsmanship can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be kinsmanship.
However, in more specific contexts, the plural form can also be kinsmanships e.g. in reference to various types of kinsmanships
or a collection of kinsmanships.
Examples
Because I am a fellow Celt and the kinsmanship runs deep and goes back centuries.
Three factors emerged named marco, personal as well as kinsmanship.