kilpakumppaninsa
Kilpakumppaninsa is a Finnish noun phrase meaning “his/her/its competitor” or “the competitor belonging to him/her/it.” It is formed from kilpakumppani, a compound of kilpa (“to compete”) and kumppani (“partner” or “companion”), with the third-person possessive suffix attached to kilpakumppani. The result kilpakumppaninsa expresses a relationship in which a particular person or entity has a specific rival in a given field.
In usage, kilpakumppaninsa appears in formal or written Finnish when describing competitive relationships, such as in
Notes on nuance: kilpakumppani highlights the rival within a shared field, whereas kilpailija is a broader