Usability is how well the site is, for instance how it looks, does the site make sense and have quality content. Are the navigation bars properly done, does the site have a lot of pop-up's and is it easy to find the home page. Lastly a site w/ flashing or blinking text can be annoying and not would not have "usability".
Accessibility allows people with a disability to perceive, understand, navigate and interact with and contribute to the web. Some of these examples are physical, hearing and visual disabilities. Although it is rare in this year and age, but taking in consideration that some people still have modems/slow internet speeds therefore if a site isn't designed properly it can be a horrible experience.
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