And no, I didn't cheat. I asked this in school and we colaborated, so I really didin't get it, WE got it.
K is like a sunrise because it appears at the end of DARK.
L is like a warm furnace because it makes IT LIT.
M is a favorite with miners because it makes ORE MORE.
N is like a pig because it makes A STY NASTY.
O is the only one of the five vowels that you can hear because all the others are in AUDIBLE (INAUDIBLE).
You actually have to think a little
And thank my buddy Mitchell and I, who sat down with a whiteboard for an hour and a half, brainstorming the snot outa this.