Yes, trustor is a Scrabble word!

...and is worth 7 points in Scrabble, and 8 points in Words with Friends

trustor

Noun

1. (law) a person who creates a trust by giving real or personal property in trust to a trustee for the benefit of a beneficiary; a person who gives such property is said to settle it on the trustee

What Scrabble words can I make with the letters in trustor?

6 Letter Words

trouts
tutors

5 Letter Words

roust
routs
stour
stout
strut
sturt
torrs
torts
torus
tours
touts
trots
trout
trust
tutor

4 Letter Words

orts
ours
oust
outs
rots
rout
rust
ruts
sort
sour
stot
torr
tors
tort
tost
tots
tour
tout
trot
tuts

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Words that can be created with an extra letter added to trustor:

H:thrustorS:trustorsE:tortures