No word spells UPSUM. Unscramble UPSUM instead and you have 15 words, and the best are SUMP and UMPS at 8 points each. 5 letters: 2 vowels and 3 consonants.
U12P34S1U12M34
Per tile: Scrabble value, Words With Friends in blue where different.
Words from UPSUM by length: 3 with 4 letters, 8 with 3 and 4 with 2. The longest answer has 4 letters.
Short meanings for the 8 highest-scoring answers, starting with SUMP and UMPS (8 points each).
Points: Scrabble · Words With Friends
None of the three games accepts UPSUM itself. Its letters still make 15 playable words, split by game below.
| Game | Scrabble US | Scrabble UK | Words With Friends* |
|---|---|---|---|
| UPSUM itself | No | No | No |
| Answers accepted (of 15) | 13 | 15 | 12 |
* From the list Words With Friends was built on; the game itself can differ.
Not in Scrabble US and Words With Friends*: UMUS and UMU, 2 in all. Not in Words With Friends*: UMS.