What are “rare” words and how are they chosen?

Rare words are identified by a blue 'R' symbol at the end of a round. The rarity of a word is determined by its usage frequency over time; in essence, a word played infrequently earns the rare status. 📖

Keep in mind, a word's rarity might differ depending on whether it's in singular or plural form. This means the same word could be deemed rare in its plural form but not in its singular form, and vice versa. 💡

Additionally, these rare words serve as tiebreakers when two players tally the same points in a round. In such cases, the player with more rare words wins! 🏆