Where does “osastonavustaja” come from?

osastonavustaja (Finnish) comes from Finnish osasto, from Finnish -sto, from Finnish -ta, from Proto-Finnic -ta, from Proto-Uralic -tä — from.

Ancestry of “osastonavustaja”, step by step

osastonavustaja traces back through two separate lines of ancestry.

via Finnish osasto

StepLanguageWordMeaning
1Finnishosastodepartment; compartment; section
2Finnish-stoForms collective nouns from nouns indicating...
3Finnish-taA suffix for the partitive singular case; Forms...
4Proto-Finnic-taPartitive ending
5Proto-Uralic-täfrom

via Finnish avustaja

StepLanguageWordMeaning
1Finnishavustajaassistant, aide, auxiliary; sidekick; aide,...
2FinnishavustaaTo assist; To abet
3Finnishapuhelp; assistance; helping hand
4Proto-FinnicapuAlternative form of *api
Every word from Proto-Uralic -tä