use (noun) and usage?

What's the difference between them? May I replace the "use" by "usage" in the following line without changing the mean of the line?

The reader should not confuse this use of the word "vector" with the physical entity discussed above.

Thanks for your time.

As shown here, they are not synonyms in the meaning 1c:

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usage

1 c : the way in which words and phrases are actually used (as in a particular form or sense) generally or among a community or group of persons : customary use of language

<like all grammarians, he professed to base his work on actual usage; in fact, however, he ... gave his approval only to such constructions as met his rigid notions of logic and propriety -- G.H.Genzmer>

<instruct pupils in the rules of good usage>

2 a : the action, amount, or mode of using : USE <the corners somewhat smashed and broken as by long, rough usage -- R.L.Stevenson> <steadily increasing usage of the nation's highways -- J.C.Nelson> <freshmen students are given a brief period of instruction in library usage -- Bulletin of Meharry Medical College> b : manner of conduct toward a person : TREATMENT <complained of ill usage at the hands of his jailors -- threats, scanty food, beatings>

3 : UTILITY, ADVANTAGE <we can fell trees and put them to our usage -- George Moore>

http://unabridged.merriam-webster.com
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Thanks a lot, Marius. A lot of info for me to digest.