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Tanger-Med is the Tangiers harbour. Tanger GR stands for Gare Routière
which is french for Central Bus Station. It can be found here according to google maps. The other Tanger stop is apparently some other bus station in Tangiers, according to this tripadvisor thread. It could very well be the CTM terminal in Tangiers. Indeed, the Wikivoyage page on Tangier says:
By Bus
Tangier has two long distance bus stations. The first, at the CTM offices near the port, is the arrival point of most CTM buses. Some other CTM buses, and those from other companies, arrive at the station on Place Jamia el-Arabia.