Unscrambling the letters in SIDE makes 13 valid words. Here is the full breakdown — longest words, top Scrabble scores, and every word grouped by length (highest-scoring first).
13total words
DIESlongest (4 letters)
DIEStop score (5 pts)
2 / 2vowels / consonants
Word lengths: 4-letter (3), 3-letter (4), 2-letter (6).