'northeast' and 'north-east' are the same. They are both nouns revealing direction. 'northeastern' is an adjective talking about directions. northeast n.[theS] 东北; 东北方[U] The wind blows from the northeast. 风从东北方刮来。 (常大写)东北部(地区)[(+of)] (大写)美国东北部 a. 形容词 (在)东北的; 朝东北的; 来自东北的[B] the northeastentrance 东北角的入口 ad. 副词 在东北; 向东北; 来自东北 At this point the road turns northeast. 路在这里转向东北。 northeastern a. 形容词 (在)东北的; 向东北的; 来自东北的 (常大写)东北部的 Heavy floods hit NortheasternIndia. 大洪水袭击了印度东北部。 参考: YAHOO
