Where does “sinappirousku” come from?

sinappirousku (Finnish) comes from Finnish sinappi, from Swedish senap, from Latin sināpi, from Latin sināpis, from Ancient Greek σίναπι, from Demotic snwpt.

sinappirousku (Finnish): A milk-cap, Lactarius flavidus

Definitions

A milk-cap, Lactarius flavidus

Ancestry of “sinappirousku”, step by step

sinappirousku traces back through two separate lines of ancestry.

via Finnish sinappi

Step	Language	Word	Meaning
1	Finnish	sinappi	mustard
2	Swedish	senap	mustard
3	Latin	sināpi	white mustard (Sinapis arvensis L.) the plant and its grain
4	Latin	sināpis	—
5	Ancient Greek	σίναπι	the mustard plant
6	Demotic	snwpt	—

via Finnish rousku

Step	Language	Word	Meaning
1	Finnish	rousku	A milk-cap
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Every word from Demotic snwpt →Every word from Ancient Greek σίναπι →Every word from Latin sināpis →