s
1
y
4
n
1
c
3
h
4
r
1
o
1
n
1
i
1
z
10
e
1
r
1
s
1
13 letters ·
30 points in Scrabble
Meaning
noun
an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)