I don't think that it's a good idea to be registering or buying domains just because they fit a pattern - like the fact that they are one word. Instead, you've got to look at the individual qualities of the domains.
There are lots of obscure words in the English language (and in other Indian languages). There are also words in odd sounding tenses. Just because they are one word doesn't make them worth registering.
The problem with these sorts of domains is that they rely on a "greater fool" theory - the owner hopes to sell to another domainer at a profit who hopes to sell to still another domainer at a profit and so on. Someone will be left holding the bag at the end of the day because they aren't really domains that will ever get a sale to an enduser.
On the other hand, a quality domain can be used by an end user to set up a website for a business. The value of these domains comes from what an end user is likely to pay and the probability that an end user will want to buy it. It doesn't rely on an inflationary domainer environment - but instead on money coming in from the outside.
So, in short, concentrate on commercial terms that have meaning and resonance. Obviously you don't want them to be too long, but just because a domain is one word doesn't in itself give it value.