Learn English – Difference between “respect of others” and “respect by others”

Close and near can be used as adjectives, and in many cases they are the same when talking about physical distances.

The train station is close.
The train station is near.

They are not the same when talking about more abstract concepts, like relationships.

My mother is close [she is 3 feet away].
My mother and I are very close [we have a strong family bond].
My mother is near [she is 3 feet away].
My mother and I are very near [we are 3 feet apart].

Only near can be used as a preposition without the word to.

*We are close the train station.
We are close to the train station [correct: close to is the proposition].
We are near the train station [correct: near is the preposition].

When you convert to adverb form, they are not interchangeable at all. In this case, closely implies "at a small distance", while nearly implies "almost but not quite"

*We are nearly following the news.
We are closely following the news.

*I closely hurt myself.
I nearly hurt myself.

* incorrect usage

decompress — that's it.

Uncompressed = not compressed; may never have been compressed in the first place. Just plain data is uncompressed data in every sense. To specifically refer to that which has undergone the process of decompressing, we would say decompressed data. Looking at it in another way, data before being compressed is uncompressed — that extracted from compressed format is decompressed data.

[Edit-1] Also, per Alenanno,
decompressed is a past participle of the verb decompress. Uncompressed is an adjective.