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Discover LudwigThe phrase "a key suspect" is correct and usable in written English.
It can be used in contexts related to crime, investigations, or legal matters to indicate an important person of interest in a case.
Example: "The police have identified a key suspect in the robbery case, and they are currently gathering evidence against him."
Alternatives: "a primary suspect" or "a main suspect."
Exact(51)
A key suspect who seems like an obvious culprit but who didn't do it.
Police are also hunting for a key suspect known only under the alias Soufiane Kayal.
The explosions came days after the arrest of a key suspect in last year's Paris massacre.
A key suspect in that case returns to court in London next Tuesday.
And it seemed incongruous when, last Friday, a judge released a key suspect in the mass European match-fixing affair.
A key suspect, former Deputy Intelligence Minister Saeed Emami, died in custody last year, reportedly a suicide.
Similar(9)
Here are a roundup of a few key suspects.
In the last week, the F.B.I.'s concerns were heightened by the government's decision to open a trial, probably in January, of half a dozen key suspects, mostly Arab Afghans who had low-level government jobs.
A 109-page report into the interrogation of key suspect David Headley, a Pakistani-American militant arrested last year and detained in the US, makes detailed claims of ISI support for the bombings.
Six days after the attack, the chief minister of Assam, the state where Guwahati is located, ordered the police to arrest a dozen key suspects.
In 1997, Los Angeles Times authors Chuck Philips and Matt Laitt reported that the key suspect was a member of the Crips acting in service of a personal financial motive.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com