LOL XDD!!!!.
Yes, descomunal is huge but there are many words revolving around bug sized things... Gigante (giant), gigantesco (gigantic), enorme (enormous), descomunal (literally "Non common"), colosal (from colossus), grande (big)...
As well as we have for small things like peque?o (small), enano (hmmm... dwarvish XD), minusculo (the most small), miscrosc?pico (you know, microsc?pical)...
Of course there are lots of phrases with no sense that refers to size like "Es un nada" (literally, it?s a nothing) that could mean something is really small.
You can always count on me logging to speak about languages :).
Zombie and Saribous, no, I?m not going to name sexual organs so you can play with these words XD!.