Words from the Letters of Theaters
Here is every English word the dictionary allows from the letters in Theaters: any set of three to 7 letters, all of them. That's 71 words in total, from the longest rebuilds down to the short ones hiding inside.
Words you can make with the letters of Theaters
71 words in total
7 letters: 3
6 letters: 6
5 letters: 19
4 letters: 21
3 letters: 22
Why anagrams of theaters exist in the first place
English is generous with re-usable letter sets, and theaters is one of the lucky ones. The same 8 letters produce 71 recognized words, and that overlap is the entire reason anagram puzzles work: a definition plus a letter set, and only the correct ordering satisfies both.
Quick tips
Longest words first, short ones last. The word picker above covers other starting points from the same tool.
The unscrambler on this site is the interactive half of this page: type any jumble of letters and it returns every dictionary word those letters can spell. The static list here is the fast path for theaters; the tool is the fast path for everything else.