Greetings,
The answer is yes and no.
Yet, the yes is very small - about 99.5% of dictionary word .coms worth registering are already registered. There are a very, very small number of dictionary .coms still available that might net you mid xx or high xx if you are lucky enough to find them among the refuse.
If you find one you like, put it in google and check out the hits; and check out what estibot(dot)com has to say. You have to be keenly aware if an odd or unfamiliar dictionary word has value to an end user or value that can be built up/established through development. This takes time. You can go to namebio(dot)com and browse through some of the .com sales - this will give you an idea of the quality you need to find for all range of sale prices.
Here is an example: All of the following dictionary .coms are available:
CONVERTIBLENESS.COM
CONVERTIBLY.COM
CONVERTINGNESS.COM
CONVERTISM.COM
CONVERTOPLANE.COM
CONVETH.COM
CONVEXEDNESS.COM
CONVEXNESS.COM
CONVEYAL.COM
CONVEYORIZATION.COM
CONVEYORIZE.COM
CONVEYORIZED.COM
CONVEYORIZER.COM
CONVEYORIZING.COM
CONVICIATE.COM
CONVICINITY.COM
CONVICTFISHES.COM
CONVICTIBLE.COM
CONVICTIONAL.COM
CONVICTIVELY.COM
CONVICTIVENESS.COM
CONVICTMENT.COM
CONVINCEDLY.COM
CONVINCEDNESS.COM
CONVINCIBILITY.COM
CONVIVIALIZE.COM
CONVOCATED.COM
CONVOCATIONALLY.COM
CONVOCATIONIST.COM
CONVOCATIVE.COM
CONVOCATOR.COM
CONVOLUTEDLY.COM
CONVOLUTEDNESS.COM
CONVOLUTIVE.COM
CONVOLVEMENT.COM
CONVOLVES.COM
CONVOLVULACEOUS.COM
CONVOLVULAD.COM
CONVOLVULI.COM
CONVOLVULIC.COM
CONVOLVULIN.COM
CONVOLVULINIC.COM
CONVOLVULINOLIC.COM
CONVOLVULUSES.COM
CONVULSEDLY.COM
CONVULSIBILITY.COM
CONVULSIBLE.COM
CONVULSIONAL.COM
CONVULSIONARIES.COM
CONVULSIONISM.COM
CONVULSIONIST.COM
Would I reg any of them? No.
Of course, I can only speak about English words. If you are dealing with other languages, things might vary a little. Keep what Rubber Duck said about 'useful meaning' in mind.
Good luck!