「neighborhood」と「neighbor」の違いは何?

I often hear some confusion about the difference between "neighborhood" and "neighbor".

(definitions from Eijiro on the Web)

neighborhood

【名】

1. 近所｛きんじょ｝、近辺｛きんぺん｝、自宅周辺｛じたく しゅうへん｝、近郊｛きんこう｝、近傍｛きんぼう｝
2. 近所｛きんじょ｝の人々｛ひとびと｝
   ・My neighborhood has a large number of Brazilian immigrants. : 私の近所にブラジル人移民がたくさんいる。

neighbor

【名】

1. 〔困ったときに助けてくれる〕隣人｛りんじん｝
   ・Good fences make good neighbors. : 《諺》良い塀は良い隣人を作る。／しっかりした垣根は隣近所を仲良く保つ。／親しき仲にも礼儀あり。
2. 近所｛きんじょ｝の人、隣席｛りんせき｝の人
   ・My nearest neighbors are cows. : 近所には牛しかいないよ。

Usually "neighborhood" means a place, but one definition also means "people", so that confuses a lot of people. Look at some examples:

○ Some of my neighborhood likes to celebrate holidays with decorations. <- "neighborhood" means people here, but it's an uncountable noun

○ Some of my neighbors like to celebrate holidays with decorations. <- "neighbors" can be a plural noun

In this photo, you can see a wreath with a small sign on it. You can't read it in the photo, but it says "Happy Halloween!" So, we can say:

× One neighborhood is celebrating Halloween. <- remember, if you mean "people", "neighborhood" is uncountable
○ One neighbor is celebrating Halloween.

Another neighbor also has a wreath on her door. Maybe she's celebrating the coming of fall.

Still, most of my neighborhood is free of holiday decorations. <- "neighborhood" means a place, not people, in this sentence

Maybe they're too busy to hang decorations, like me. I love this season more than any other, but I'd rather things just be clean than see a lot of holiday stuff that will probably hang on doors too long.

Anyway, a happy autumn to you!