There is a useful article on Lexology by Cocalis & Partners summarising different types of partnerships and other business vehicles in Greece.
The article is titled ‘Commercial corporate entities: a brief outline’ and is at https://www.lexology.com/library/detail.aspx?g=a6e27739-9321-47fa-bfa7-bfcac22f843d&l=8JG74F4
(if you need to subscribe to Lexology to access it, it is free do do so - see further https://www.lexology.com/account/rss)