The Word with the Greatest Number of Playable Anagrams in Scrabble

What word can be reassembled into the most new words (where each new word uses all the original letters)?  The answer is "spear" which can form 11 words:

apers
apres
asper
pares
parse
pears
presa
rapes
reaps
spare
spear

A close second is the word "least" which can be rearranged into 10 words:

least
setal
slate
stale
steal
stela
taels
tales
teals
tesla

The chart below lists all the most rearrangeable words.  Note in particular that the most "rearrangeable bingo" is "retains."  Also note that this information is in regards to the OWL2 word list.

               number
letters        of words
-------        --------

spear          11
least          10
retains        9
insert         9
scrape         9
resent         8
prise          8
laser          8
lapse          8
east           8

SPEAR:  apers, apres, asper, pares, parse, pears, presa, rapes, reaps, spare, spear
LEAST:  least, setal, slate, stale, steal, stela, taels, tales, teals, tesla
RETAINS:  anestri, antsier, nastier, ratines, retains, retinas, retsina, stainer, stearin
INSERT:  estrin, inerts, insert, inters, niters, nitres, sinter, triens, trines
SCRAPE:  capers, crapes, escarp, pacers, parsec, recaps, scrape, secpar, spacer
RESENT:  enters, nester, renest, rentes, resent, tenser, ternes, treens
PRISE:  peris, piers, pries, prise, ripes, speir, spier, spire
LASER:  arles, earls, lares, laser, lears, rales, reals, seral
LAPSE:  lapse, leaps, pales, peals, pleas, salep, sepal, spale
EAST:  ates, east, eats, etas, sate, seat, seta, teas

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