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)? Under SOWPODS, two words are tied for this honor:  SPARE and STARE, both of which can form 13 anagrams.

The anagrams of SPARE are

apers
apres
asper
pares
parse
pears
prase
presa
rapes
reaps
spaer
spare
spear

The anagrams of STARE are

arets
aster
earst
rates
reast
resat
stare
stear
strae
tares
taser
tears
teras

A close second are the words STALE and STALER, each of which can be rearranged into 12 words.

The anagrams of STALE are

least
leats
salet
setal
slate
stale
steal
stela
taels
tales
teals
tesla

The anagrams of STALER are

alerts
alters
artels
estral
laster
ratels
salter
slater
staler
stelar
talers
tarsel

The chart below lists all the most rearrangeable words. Note in particular that the most "rearrangeable bingos" are RETAINS, SEATING, and ANGRIEST. Also note that this information is in regards to the SOWPODS word list only; there is an equivalent list for OWL2.

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

spare          13
stare          13
stale          12
staler         12
staple         11
retains        11
seating        11
angriest       11
steer          10
pales          10
searing        10

SPARE:  apers, apres, asper, pares, parse, pears, prase, presa, rapes, reaps, spaer, spare, spear
STARE:  arets, aster, earst, rates, reast, resat, stare, stear, strae, tares, taser, tears, teras
STALE:  least, leats, salet, setal, slate, stale, steal, stela, taels, tales, teals, tesla
STALER:  alerts, alters, artels, estral, laster, ratels, salter, slater, staler, stelar, talers, tarsel
STAPLE:  palest, palets, pastel, peltas, petals, plaste, plates, pleats, septal, staple, tepals
RETAINS:  anestri, antsier, nastier, ratines, resiant, retains, retinas, retsina, stainer, starnie, stearin
SEATING:  easting, eatings, gainest, genista, ingates, ingesta, seating, tagines, tangies, teasing, tsigane
ANGRIEST:  angriest, angstier, astringe, ganister, gantries, granites, ingrates, rangiest, reasting, stearing, tasering
STEER:  ester, reest, reset, retes, steer, stere, teers, teres, terse, trees
PALES:  lapse, leaps, pales, peals, pelas, pleas, salep, sepal, spale, speal
SEARING:  angries, earings, erasing, gainers, graines, reagins, regains, reginas, searing, seringa

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