Where does “vanutukko” come from?

vanutukko (Finnish) comes from Finnish vanu, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

Ancestry of “vanutukko”, step by step

vanutukko traces back through two separate lines of ancestry.

via Finnish vanu

StepLanguageWordMeaning
1Finnishvanucotton wool, absorbent cotton, wadding;...
2Finnish-uForms nouns from verbs. Most common with "e"- and...
3Proto-Finnic-uForms nouns from adjectives, nouns

via Finnish tukko

StepLanguageWordMeaning
1Finnishtukkotuft; clog, obstruction, block
2Finnishtukkiato block, to bar, to obstruct; to clog; "tukkia...
Every word from Proto-Finnic -uEvery word from Finnish -uEvery word from Finnish vanu