Where does “pyykkitupa” come from?

pyykkitupa (Finnish) comes from Finnish tupa, from Proto-Finno-Ugric *tupa, from Icelandic stofa, from Old Norse stofa, from German stōve, from Old Saxon *stova, from Proto-West Germanic *stobu.

Ancestry of “pyykkitupa”, step by step

pyykkitupa traces back through two separate lines of ancestry.

via Finnish tupa

Step	Language	Word	Meaning
1	Finnish	tupa	living room, main room; cottage, cot; room
2	Proto-Finno-Ugric	*tupa	—
3	Icelandic	stofa	a living room; a classroom, a room
4	Old Norse	stofa	room, living room
5	German	stōve	—
6	Old Saxon	*stova	—
7	Proto-West Germanic	*stobu	—

via Finnish pyykki

Step	Language	Word	Meaning
1	Finnish	pyykki	laundry; A post that is used to mark something,...
2	Swedish	byk	a bunch of clothes to be washed
3	Swedish	byka	to wash
4	Middle Low German	büken	—

Every word from Proto-West Germanic *stobu →Every word from Old Saxon *stova →Every word from German stōve →