Hi !
Suppose i select few keywords and short list 5 keywords to use them in a domain name, and now i couldn't select any one or two among those 5.

Is there any criteria to tell which 2 is better among all 5?
should i choose one which sound better or one which describes the website more?

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You would be wasting your time!

No!

No
Choose something that can be easily branded.
That can be typed in accurately.
That you can tell someone on a noisy mobile (cell) phone and have them understand it.
And more importantly memorable!

Use keywords that have plenty of searches and check also your competitors...

First keyword is the best, the second is better and so on...

Use Googles keyword tool. Can't think of the link right now, but I'm sure if you Google "Google Keyword Tool" you'll find it. It gives some pretty good details about the keyword searches!

Better use Google Suggests and analyze first the keyword/s that is/are suitable for your site

For brand recall - a shorter domain will be best. One that could easily be remembered.
For SEO - choose the domain which closely describes your site, have a keyword in it as this will help you in your rankings. New sites are given a boost in rankings by Google recently so long as you have (a few) strong backlinks IMO

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you have to find the keyword which is more popular and are used commonly also it should be related to your website to make use it in your website. use wordtracker tool like freekeywords.wordtracker.com for popular keyword.

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SEO, Sales & Marketing strategy