# What is a Spectral Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles.

If a word conforms to a special rule, I call it a Spectral Word™.
Use the examples below to find the rule.

$$\def\Pad{\P{0.0}} \def\Title{\textbf{ Spectral }} \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\ \def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^™\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2017.02.04}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline \text{ACTION}&\text{REACTION}\\\hline \text{BERRY}&\text{OLIVE}\\\hline \text{FIELD}&\text{YARD}\\\hline \text{HAMMER}&\text{GAVEL}\\\hline \text{HEAD}&\text{BRAIN}\\\hline \text{HOUSE}&\text{IGLOO}\\\hline \text{PRINT}&\text{VIEW}\\\hline \text{RAFT}&\text{WHEEL}\\\hline \text{SICKNESS}&\text{OVERHEATED}\\\hline \text{STONE}&\text{BOW}\\\hline \text{THROAT}&\text{NOSTRIL}\\\hline \text{TIN}&\text{IRON}\\\hline \text{TOOTH}&\text{ARM}\\\hline \text{WOOD}&\text{RAIN}\\\hline \end{array}$$

CSV version:

Spectral Words™,Not Spectral Words™
ACTION,REACTION
BERRY,OLIVE
FIELD,YARD
HAMMER,GAVEL
HOUSE,IGLOO
PRINT,VIEW
RAFT,WHEEL
SICKNESS,OVERHEATED
STONE,BOW
THROAT,NOSTRIL
TIN,IRON
TOOTH,ARM
WOOD,RAIN


The puzzle satisfies the series' inbuilt assumption, that each word can be tested for whether it is a Spectral Word™ without relying on the other words.

These are not the only examples of Spectral Words™, many more exist.

I think I have the answer:

A spectral word is one that can be prefixed by a colour of the rainbow to produce another word:

action → REDaction
berry → BLUEberry
field → GREENfield
hammer → YELLOWhammer
house → GREENhouse
print → BLUEprint
raft → REDraft
sickness → GREENsickness
stone → REDstone
throat → REDthroat
tin → INDIGOtin
tooth → BLUEtooth
wood → REDwood

• Looks good, but what about REDneck? – M Oehm Feb 20 '17 at 12:00
• @MOehm That is a very good question. – squeamish ossifrage Feb 20 '17 at 12:18
• What's greensickness? – Craig McMahon Feb 20 '17 at 13:35
• It's always difficult to come up with a title that conveys some meaning and yet doesn't point to directly into the right direction. As for the pattern: look at the first letters of the Not Spectral Words ;) – Levieux Feb 20 '17 at 14:10
• @Levieux: looks safe now. :) Well done on the extra hint in the NSWs, which I failed to spot. – M Oehm Feb 20 '17 at 16:05