Roman Senate
In Latin, "Senātus" is a nominative singular noun meaning "Senate". "Populusque" is compounded from the nominative noun "Populus", "the People", and "-que", an enclitic particle meaning "and" which connects the two nominative nouns. The last word, "Rōmānus" ("Roman") is an adjective modifying the whole of "Senātus Populusque": the "Roman Senate and People", taken as a whole. Thus, the phrase is translated literally as "The Roman Senate and People", or more freely as "The Senate and People of Rome".