Could you spell this word before I told you how to do it? annihilation

I usually get it right. I have to remind myself that the Latin root is "nihil", meaning "nothing". Then it's pretty easy to remember the rest.

I have never had a problem with it.

Rpf, that is a great idea.  I usually get the words from the common root myself.  I have trouble remember on this word where the consonants appear, so this does help.

Now let's do diarrhea.

Another irritation for me.

Damn you are one fine, lucky person.

I've seen the word in crossword puzzles a few times. Those are useful things for learning correct spellings.

Honestly, I have trouble with diarrhea too >_<;
For some reason, I think back to when I was in Mexico getting medicine to treat it. And I think of the Spanish pronunciation, rolling the double "r". And then I also think of Rhea Perlman.

I'm good with that one lol.
One word that had me effed up for a long time is necessary. I couldn't figure out where to put the s and the c.

Maybe there is such a thing as ADD.  ;)

It's one of those words I write and it never looks right and I end up checking the dictionary.

I agree with you 100%

Yep...That's an easy one for me.

The one that bags me is VACUUM. 

It is unless you think about the presence of "nihil" in there. Annihiliate literally means "to make into nothing".