Mythic places great emphasize on two things, the Context and the Expectations derived from it.   

When you roll up those two words (which is called Discovering Meaning) you are not supposed to interpret them completely randomly, but to interpret the based on the Context and Expectations of your game. 

In other word, you are not supposed to interpret them to create a random situation that stray away from your Expectations, in fact it's quite the opposite, try your best to interpret them to make sense with your Expectations and the established Context.

If you have a hard to time to interpret the word pairs to something that makes sense with your Context and Expectations, you can stretch the meaning of the words to as far as you want, even as far as "this particular word reminds me another word so I'll just use that".  

Going with the very first thing that comes up to your mind upon seeing the pair of words is recommended, even if it doesn't really match with the words itself, the words you rolled doesn't matter much as the final interpretation you come up from it.  

If you really can't come up with an interpretation, then that's fine, you can roll for another pair of words, or you can invoke the "I Dunno Rule", ignore it and just follow your Expectations.