The German translation of science is Wissenschaft. Natural Sciences is Naturwissenschaft.
The German word for "German" is "Deutsch". Pronounced doitch. "Deutsch" as a noun is neuter, thus the definite articles are "das" (nominative and accusative), "des" (genitive), "dem" (dative). When...
Deutsch = German ("Doych" is close to how the word is pronounced.) Ein Deutscher = a German man Deutsche Sprache = German language
Eine deutsche Wurst. Or in general: Deutsche Wurst.