Hi, I have seen varied meaning of 'brandables' but most I see is that 'brandables' means meaningless one worders - meaning that you can just use them and brand them for anything. I would compare 'brandable' to 'keyword domains' which means that either one or both components convey a meaning and are typically used to represent what they are used for.
Above names seem to be more 'keyword domains' as all of them except last one (Wepty.com) convey a meaning. The best test to see the popularity of a keyword domain is
i) Can you fit both the constituent word in a sentence, a sentence that is grammatically correct and make sense. So try to see if you can frame such sentences and in how many context
ii) If you are successful in the step above, find out the 'domains' (means the areas) where your name can potentially be used. More 'domains' you can use your name in, better it is. Meaning if it is generic - more value, more 'domains', more potential applications, more buyers
iii) Do a search in google, putting both of the words in double quotes, like for "Attachbig.com" I would put "attach big" - Check how many results you find. 50,000 results - it is decent, 100,000 is good (you cannot go wrong). But please see if the results are in what context - are they in any business context (I would not give value to the words used in casual conversations, e.g. I am gonna (and if you have domain name - iamgonna.com - no one cares how many hundreds of thousands of results google returns). The reason is that if you plan to sell it (and every domainer should think that way), no business is going to name such a name as their business name. Businesses are the one who are going to buy your name.
Lastly, when you look at the name, you have to ask yourself a question
Would you run a business of your own under the name you have?
If you cannot come up with a good 2/3 good business uses, I would say - it was not the best buying decision you made.
Additionally, I would not value too much for non .com's - there is a mighty good chance that .com site for your name exists, if not, it will exist one day and you will just help drive the traffic to their name.
Hope my note helps.
Best