Well, you can use the last 4 letters of each and find something easy to remember! 
Yes, our version was based on the 7th letter:
stalacTite - T is an image of a stalactite hanging from the ceiling
stalagMite - M is two stalagmites on the floor
stalagNate - the left part of N is an upwards growing stalagmite, the right part of N is a downwards growing stalactite, and they touch each other
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And we’re off! The Vigilant-class airship Kokko soars towards the ceiling.