Where does “suursanakirja” come from?

suursanakirja (Finnish) comes from Finnish sanakirja, from Swedish ordbok, from Swedish ord, from Old Swedish orþ, from Old Norse orð, from Proto-Germanic wurdą, from Proto-Indo-European werdʰo-, from Proto-Indo-European werh₁- — to speak, say.

suursanakirja (Finnish): large dictionary, comprehensive dictionary