This is the 9878th most frequent Swedish word.
handbolls
"Handbolls" is the possessive form of "handboll," meaning "handball's" (e.g., something belonging to handball).
In this sentence, 'handbolls' is part of the word 'handbolls' (handball) used in the context to denote the sport of handball being practiced in a team.
Jag spelar i stadens handbolls lag.
I play in the city's handball team.
Here, 'handbolls' modifies 'turneringen' (the tournament), indicating that the tournament is related to the sport of handball.
Handbolls turneringen börjar i morgon.
The handball tournament starts tomorrow.
In this construction, 'handbolls' pairs with 'boll' (ball), forming 'handbolls boll,' specifying it as a ball meant for playing handball.