3 letters:
ray,
low,
ash,
cut,
pre
4 letters:
high,
bent,
pass,
flat,
type,
dual,
post,
wave
5 letters:
focal,
ideal
6 letters:
system,
sample,
double,
single,
second,
curved,
triple,
simple,
normal,
etalon,
filter
7 letters:
crystal,
grating,
typical,
primary,
optical,
perfect,
tunable,
visible
8 letters:
graphite,
suitable,
ordinary,
variable,
infrared,
simplest,
modified
9 letters:
secondary,
spherical,
pyrolytic,
incidence,
auxiliary,
efficient,
expensive,
prismatic
10 letters:
instrument,
diffracted,
dispersive,
mechanical,
trochoidal,
controlled,
calibrated,
adjustable,
sequential,
asymmetric
11 letters:
combination,
subtractive
12 letters:
conventional
13 letters:
electrostatic,
hemispherical,
spectroscopic
Commonly used words are shown in bold. Rare words are dimmed.
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