How many easy-to-remember words are there in English, does anyone happen to know? Does Diceware's list include almost all of them? By 'easy-to-remember', I mea

How many easy-to-remember words are there in English, does anyone happen to know? Does Diceware's list include almost all of them? By 'easy-to-remember', I mean for 99% of the world's English speaking population (i.e., for a widely used application). I'm trying to estimate the entropy of random, easy-to-remember words. I'm not trying to generate a list (which would vary by region and country).