RAREFACTION Scrabble 16 Words With Friends 18 Scrabble letter values: R1A1R1E1F4A1C3T1I1O1N1 = 16 Definition noun a decrease in the density of something. Examples “a sound wave causes periodic rarefactions in its medium” See all 550 words you can make from RAREFACTION → 11-letter words Words starting with R Words ending with N ← Unscramble different letters