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Discover LudwigThe phrase "guest speaker" is correct and can be used in written English.
You can use it when describing a person who has been invited to speak at an event, such as a seminar or a conference. For example: "The conference will feature a guest speaker from Egypt to discuss Middle Eastern politics."
Dictionary
guest speaker
noun
Person who has been invited to present a speech at an event where they are not the host.
Exact(60)
Guest speaker: Diane Abbott.
But the guest speaker had other plans.
Holtz's father was the guest speaker.
Cynthia Nixon was the guest speaker".
I was there as a guest speaker.
SCARSDALE -- The Rev. Calvin Butts, guest speaker.
The rabbi was there as a guest speaker.
Nigel Lawson was the guest speaker, in his old room.
The help was Clint Eastwood, a surprise guest speaker.
NEW ROCHELLE -- The Rev. Michael J. Rouse, guest speaker.
(Usually, the price is $35 to $40; it's higher when there is a guest speaker).
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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