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The second part of Snorri Sturluson's Prose Edda the Skáldskaparmál (Old Norse pronunciation: ['skaldskapar?m?:l], Icelandic pronunciation: ['skaultskapar?mau:l], "language of poetry"; c. 50,000 words) is effectively a dialogue between Ægir, the Norse god of the sea, and Bragi, the god of poetry, in which both Norse mythology and discourse on the nature of poetry are intertwined. The origin of a number of kennings is given; then Bragi delivers a systematic list of kennings for various people, places and things. He then goes on to discuss poetic language in some detail, in particular heiti, the concept of poetical words which are non-periphrastic (like steed for horse), and again systematises these. This in a way forms an early form of poetic thesaurus.