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northwestern + noun
northwestern 一般作定语，修饰名词，表示“位于西北的”。
The northwestern coast is known for its dramatic cliffs.
西北海岸以其陡峭的悬崖而闻名。
西北部的；西北方的
先理解核心含义，再看它在真实句子里的用法。
西北部的；西北方的
situated in or oriented toward the northwest
The northwestern coast is known for its dramatic cliffs.
西北海岸以其陡峭的悬崖而闻名。
西北的；向西北的；来自西北的。
Of or pertaining to the northwest; from or to in such a direction.
与以所在基本方向命名的任一特定地区有关的。
Of or relating to any of various particular regions named for the cardinal direction in which they lie.
位于或朝向西北的
situated in or oriented toward the northwest
(风)从西北方向吹来的。
Blowing from that direction.
The northwestern corner of the park has the oldest trees.
公园的西北角有最古老的树木。
We took the northwestern route to avoid the heavy traffic.
我们走了西北方向的路线以避开繁忙的交通。
A cold wind blew from the northwestern hills.
一阵冷风从西北部的山丘吹来。
northwestern 一般作定语，修饰名词，表示“位于西北的”。
The northwestern coast is known for its dramatic cliffs.
西北海岸以其陡峭的悬崖而闻名。
表示某地区的西北部时，常用 the northwestern part of ... 结构。
The northwestern part of the valley receives less rain.
山谷的西北部降雨较少。
Not this
The northwestern of the country is mountainous.
Use this
The northwest of the country is mountainous.
northwestern 是形容词，不能单独作名词表示“西北地区”；表示方向或地区需用名词 northwest。
Not this
She grew up in northwestern of China.
Use this
She grew up in northwestern China.
形容词 northwestern 应直接修饰名词，不能在后面加介词 of；若要用介词结构，应改用名词：the northwest of China。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
美国西北部
She moved to the northwestern United States for work.
她为了工作搬到了美国西北部。
中国西北地区
The northwestern China region is known for its vast deserts.
中国西北地区以广阔的沙漠闻名。
西北地区
This plant grows only in the northwestern region of the country.
这种植物只生长在该国的西北地区。
西北海岸
The northwestern coast has experienced severe storms this winter.
今年冬天西北海岸经历了严重的风暴。
西北角
There is an old tower in the northwestern corner of the city.
这座城市的西北角有一座古老的塔。
Use northwestern naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象指南针先指北（north）再偏西（western），合起来就是“西北的”。
语域：neutral 常见场景：地理或行政区划描述、方位指向说明 通常用于地理方位、地名或机构名称等场景，属于中性的书面用词；口语中更常说 northwest 或 in the northwest。比较常见于书面或正式描述。
与 northwestern 的结尾 /ˈwɛstɚn/ 真正押韵的有 western、southwestern、midwestern；northeastern 和 northwest 是拼写上的近似词，但 northeastern 的重读元音是 /iː/（/ˌnɔrˈθiːstɚn/），northwest 缺少结尾的 /ɚn/（/ˌnɔrθˈwɛst/），north 也只共享开头的 /nɔrθ/，因此都不押韵。
Dictionary facts from ECDICT, WIKTIONARY.