1343 stations, and the places on their pages. A name, or a code like G-01.
JR East is a different railway from the subway. Tokyo Metro and Toei run the subway; JR runs its own lines across and around it, mostly above ground.
Your Suica or PASMO works on both. Tap in and out the same way and the right fare is taken, so an IC card is the simplest way to move between the two.
Paper subway tickets and subway day passes are not accepted, and a journey that uses both railways pays a subway fare and a JR fare rather than one combined fare.
Hatchobori 八丁堀
Etchujima 越中島
Shiomi 潮見
Kasai-Rinkai-Koen 葛西臨海公園
Maihama 舞浜
Shin-Urayasu 新浦安
Ichikawa-Shiohama 市川塩浜
Futamata-Shimmachi 二俣新町
Minami-Funabashi 南船橋
Shin-Narashino 新習志野
Kaihimmakuhari 海浜幕張 Terminus