Five consonants. Four words. One .com.
RDCTN is what survives when you strip the vowels from reduction, redaction, eradication and the French rédaction — and what survives is identical in all four. Three of them mean the same thing: taking something away.
It is a five-character .com for a company whose product is subtraction — carbon, cost, risk, waste, dose, noise, a threat on a network, or the parts of a document nobody outside may read.
The near misses do not collide, which is unusual for five letters: radiation → RDTN · dedication → DDCTN · reduplication → RDPLCTN. One skeleton, one field of meaning.