So first up, words that failed. I split them up by "proper" fails (meaning, they SHOULD be in the game, but aren't) and "improper fails", words that don't fit under the Scribblenauts rules and thus don't have to be in the game.
Not tangible objects
BOOBS (not an object) - Also would be vulgar
MEANING OF LIFE (not an object)
ANTIDISESTABLISHMENTARIANISM (not an object)
PERPETUALITY (not an object)
ANNUAL - They probably meant the shorthand for an "Annual flower", but "annual" itself doesn't count as an object
LEG WOUND - Not really a tangible object or noun
GLITCH - Not a tangible word, though I do agree it should be in
Not in the dictionary
HAMMER OF THOR (not in dictionary)
DANCING BANANA (not in dictionary)
ONM (not in dictionary)
RAPTOR JESUS (not in dictionary, potentially blasphemous)
SHOOP DA WOOP (not in dictionary)
Trademarked or proper nounsJEDI (trademarked)
RUDOLPH - A proper noun. It'd only be icing on the cake if he were in, like Santa...
Words that are too specific or probably already have variations in gameSANDBOARD - Seems identical to a snowboard, which I'm sure is in
SHOVELWARE - Probably too specific of a word. "Videogame" is probably in
MISANTHROPE - Again, most likely too specific of a word. A misanthrope, like one of the -phobe nouns, is more of a human with a non-tangible way of describing them, which would probably be hard to represent. You can, however, spawn in a human and make him fear humans in the level editor
COULROPHOBE - Same as above
DELTOID - Spellcheck tells me this isn't actually a word...hmm. Maybe it needed to be "Deltoids" or "Deltoid Muscle"?
So then...not too bad. Out of the 25 words, only 4 of which "properly" failed, and even among those 5, 3 of which have questions about them.
Now let's look at the items that DID make the cut.
SIBERIAN HUSKY - YES!
FLANNEL - YES!
PEPPER (both the condiment and the vegetable)
BANDICOOT - I didn't know this was a real word.
NAPPY (you can put it on him)
TATTOO (makes a sheet of stick-on tattoos)
BOMBARD (makes a cannon) - I thought bombard was a verb...hmm
MAGIC EGG (same as a normal egg) - xd, what the hell is a magic egg?
STARITE (but it's a fake one)
EVERYTHING - I wonder what this turns up
C4 (input CFOUR)
JEWEL CASE (but makes a Jewellery Box) - Makes sense
SD CARD (but makes a playing card) - Probably means it isn't it, so the game defaults to the generic "card"
SOLAR SYSTEM (but makes a star) - LAME AS HELL!
GALAXY - Yet this is in...?
RICKROLL (makes Rick Astley appear) - Who promptly explodes. No, seriously.
LASER SWORD (but makes a normal sword) - Makes sense
I CAN HAZ CHEEZBURGER (makes a cheeseburger) - ...wow
SCRIBBLENAUTS (makes the orginal character design) - What weird wording...
5TH CELL (makes the developer's logo)
LOLWUT (makes his head huge) - Uh, what? Does he means the lolwut pear?
MORON (makes a dunce)
CREDIT CARD -
SPY (makes a Ninja) - LAME AS HELL
So as you can see, Scribblenauts already has a pretty robust input device. Even if you get a word wrong or you try to be too specific it spawns in what it thinks you want. All in all the testing was an amazing success. Tallying it all up, out of the 93 "proper" words that were checked, only 4 failed.
Not too bad. Not too bad at all.