Where does “nakutustunnistin” come from?

nakutustunnistin (Finnish) comes from Finnish tunnistin, from Finnish tunnistaa, from Finnish tuntea, from Proto-Finnic tuntedak, from Proto-Uralic tumte- — to know.

Ancestry of “nakutustunnistin”, step by step

nakutustunnistin traces back through two separate lines of ancestry.

via Finnish tunnistin

Step	Language	Word	Meaning
1	Finnish	tunnistin	sensor; detector; First-person singular...
2	Finnish	tunnistaa	to identify, recognise/recognize; to name
3	Finnish	tuntea	to feel, sense; to know, be familiar with
4	Proto-Finnic	tuntedak	to know; to feel
5	Proto-Uralic	tumte-	to know

via Finnish nakutus

Step	Language	Word	Meaning
1	Finnish	nakutus	any knocking sound such as that made by a...
2	Finnish	us	-ing

Every word from Proto-Uralic tumte- →Every word from Proto-Finnic tuntedak →Every word from Finnish tuntea →