These are both great words, tsuwm. I hope this little limerick will make it easier for us to remember them, and to distinguish them from one another. [It certainly makes it easier for me. :) ]

In Maryland, there's a mythical monster
A fiend by the name "snallygaster".
Yet more fiendish and grievous
'Cause he's shrewd and more devious
Is a politician we call "snollygoster".