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What is a Reciprocal Word?™

_{This is in the spirit of the What is a Word™/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.}

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

Reciprocal Words™	Not Reciprocal Words™
COMMENT	REPLY
PULP	FICTION
FOOL	JOKER
STARTS	BEGINS
REGGAE	DANCEHALL
FLUID	SOLID
INTERNAL	EXTERNAL
RESEARCHER	INVESTIGATOR
OUZO	SAMBUCA
POSTMAN	TAMPONS
ACHING	HURTING
TEST	DRIVE
PECAN	WALNUT
INTEND	AIM
WRECKING	BASHING
FAMINE	HUNGER
SCALE	MODEL

In case you want it in CSV:

Reciprocal Words™,Not Reciprocal Words™
COMMENT,REPLY
PULP,FICTION
FOOL,JOKER
STARTS,BEGINS
REGGAE,DANCEHALL
FLUID,SOLID
INTERNAL,EXTERNAL
RESEARCHER,INVESTIGATOR
OUZO,SAMBUCA
POSTMAN,TAMPONS
ACHING,HURTING
TEST,DRIVE
PECAN,WALNUT
INTEND,AIM
WRECKING,BASHING
FAMINE,HUNGER
SCALE,MODEL

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

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

Hint:

You'd better not suffer from aibohphobia if you want to solve this puzzle.

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