There are 28 words hidden in the letters of PROPER, from 6 two-letter words up to PROPER (6 letters). For points, PROPER is best at 10.
No other single word uses all 6 letters of PROPER. PROPER has 6 letters: 2 vowels and 4 consonants, worth 10 points before any board bonuses.
6-letter words 1
5-letter words 3
porer7repro7roper7
4-letter words 8
pepo8pope8pore6prep8prop8repo6repp8rope6
3-letter words 10
err3ope5ore3pep7per5poe5pop7pro5rep5roe3
2-letter words 6
er2oe2op4or2pe4re2
Words are from our open word list and include some game-only words. Rude words are left out of this page; the unscrambler shows every valid word, lets you add blank tiles and filter by length.