The main difference between Ouzo and Sambuca is that the Ouzo is a anis drink and Sambuca is a Italian anise-flavoured liqueur.
Sambuca (Italian pronunciation: [samˈbuːka]) is an Italian anise-flavoured, usually colourless, liqueur. Its most common variety is often referred to as white sambuca to differentiate it from other varieties that are deep blue in colour (black sambuca) or bright red (red sambuca). Like other anise-flavoured liqueurs, the ouzo effect is sometimes observed when combined with water.
From Greek ούζο (oúzo), either from Turkish üzüm (“grape”) or from the Italian uso Massalia (for use in Marseille) stamped on selected silkworm cocoons exported from Tyrnavos in the 19th century, standing for "superior quality". Other: from the ancient greek word όζω - οσμή (ózo - osmí = smell) because of the strong smell of the drink.
ouzo (countable and uncountable, plural ouzos)
From Italian sambuca, from Latin sambūcus (“elderberry”).
sambuca (plural sambucas)