Where does “synonyymius” come from?

synonyymius (Finnish) comes from Finnish synonyymi, from Swedish synonym, from Latin synōnymum, from Ancient Greek συνώνυμος, from Ancient Greek σῠν-, from Ancient Greek σύν, from Proto-Hellenic *ksún — beside, with.

synonyymius (Finnish): synonymity

Definitions

synonymity

Ancestry of “synonyymius”, step by step

Step	Language	Word	Meaning
1	Finnish	synonyymi	synonym, as a word meaning the same as another...
2	Swedish	synonym	synonymous; synonym
3	Latin	synōnymum	synonym
4	Ancient Greek	συνώνυμος	Having the same name; Having only one meaning:...
5	Ancient Greek	σῠν-	together; with, together
6	Ancient Greek	σύν	beside, with
7	Proto-Hellenic	*ksún	beside, with

Every word from Proto-Hellenic *ksún →Every word from Ancient Greek σῠν- →Every word from Ancient Greek σύν →