Where does “kehruuttaa” come from?

kehruuttaa (Finnish) comes from Finnish kehruu, from Finnish -uu, from Finnish -au, from Finnish -ao, from Proto-Finnic -ado, from Proto-Finnic -o, from Proto-Uralic -w.

Ancestry of “kehruuttaa”, step by step

Step	Language	Word	Meaning
1	Finnish	kehruu	spinning converting fibres into yarn or thread
2	Finnish	-uu	Forms nouns from verbs
3	Finnish	-au	—
4	Finnish	-ao	—
5	Proto-Finnic	-ado	—
6	Proto-Finnic	-o	Forms action/result nouns from verbs
7	Proto-Uralic	-w	—

Every word from Proto-Uralic -w →Every word from Proto-Finnic -o →Every word from Finnish -uu →