The letters in WINDOWS make 62 words of two letters or more. The longest is WINDOWS at 7 letters, and the highest-scoring is WINDOWS at 14 points.
No other single word uses all 7 letters of WINDOWS. WINDOWS has 7 letters: 2 vowels and 5 consonants, worth 14 points before any board bonuses.
7-letter words 1
6-letter words 4
5-letter words 5
downs9indow9widow12winds9winos8
4-letter words 16
dins5dons5down8dows8ions4nodi5nods5nows7owns7snow7sown7wind8wino7wins7wons7wows10
3-letter words 23
din4dis4don4dos4dow7ids4ins3ion3nod4nos3now6ods4ons3own6sin3sod4son3sow6win6wis6won6wos6wow9
2-letter words 13
do3id3in2is2no2od3oi2on2os2ow5si2so2wo5
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.