Is this the most words that can be formed by rearranging the same letters?

Yes, that’s all there are for that particular group of letters.

Any time you want to examine a word’s or expression’s anagramming possibilities, go here:
http://www.wordsmith.org/anagram/
(Use ‘Advanced’ if you want to see only one-word anagrams.)

This thread does not have to end here. Jellies, what are some of your favorite anagrammable words? Here are several of mine:

name
time
live
staple

@Jeruba O.K., I’ll take up your challenge! One of my favorite, as of tonight, anagrammable words is “laughter,” so here we go:

Lager Hut. Sounds like my kind of place!
Hare glut. More rabbits than you really want.
Alert! Ugh! Response to someone trying wake you out of a sound sleep in the morning.
Later! Hug! Similar to the air kiss
Hat gruel. I’d rather eat cardboard soup, thank you!
A leg hurt! When you’re in so much pain you can’t form complete sentences.
Halt Urge! Self-control, I must exercise some self-control here!
Earl Thug. An aristocratic loan shark’s enforcer.
Ah! Gel Rut! Time to get a new do, I guess.

@Jeruba, You equaled my six words using the six letter word staple. That is neat. Have you ever listened to NPR on Sunday mornings? Will Shortz, crossword editor of the N Y Times, gives word challenges from submissions by listeners. I think your example would make a good challenge, to come up with six letters than can be arranged to form a word in six different ways.

No, @LostInParadise, but I’ve seen his columns in Games magazine.

I worked out the “stop” group when I was a kid playing with words, but I didn’t happen on “staple” until I started playing a computer version of Perquackey with my husband maybe 25 or 30 years ago. I learned to look for certain letter groups immediately (item, mean…) because I knew they were good for anagrams. As soon as I saw the letters in pastel appear (plates, pleats, palest…), I knew I could fill my six-word column as fast as I could type. I used to beat the kr*p out of him at Perquackey.

One of the reasons I never learned to drive was (and still is) my habit of working out anagrams from shop signs, billboards and the like. It is a distracting hobby.