existent
Being present; actually existing.
Gibt es Beweise dafür, dass diese Spezies noch existent ist?
Is there evidence that this species is still existent?

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Being present; actually existing.
Gibt es Beweise dafür, dass diese Spezies noch existent ist?
Is there evidence that this species is still existent?

The adjective 'existent' belongs to the word family of 'existieren' (to exist) and 'die Existenz' (existence). All of these words refer to the being or presence of something.
Man weiß nicht, ob dieses Dokument noch existent ist.
It is not known whether this document is still existent.
'Existent' is almost always used predicatively, meaning after a verb such as 'sein' (to be) or 'bleiben' (to remain). Attributive use before a noun, e.g. 'ein existentes Problem' (an existent problem), is very rare and sounds very formal.
Die Gefahr ist weiterhin existent.
The danger is still existent.
The word 'existent' belongs to elevated or formal language, especially administrative and scientific language. It is rarely used in everyday conversation.
Laut den Akten ist die Firma nicht mehr existent.
According to the files, the company is no longer existent.
indeed / actual
'tatsächlich' and 'existent' both have to do with reality. 'tatsächlich' is used very generally when you want to say that something is really the case or corresponds to the facts. 'existent' means that something is present or really exists. It sounds much more formal and is more likely to be used in factual texts. In everyday language, people usually say 'es gibt' (there is / there are) or 'tatsächlich vorhanden' (actually present). 'existent' fits especially well when talking about things, problems, or possibilities whose presence is being checked.

Für den Bericht prüft das Team, ob die genannten Risiken wirklich existent sind.
For the report, the team checks whether the risks mentioned really exist.
Julia ist überrascht, dass der kleine Laden bei schlechtem Wetter tatsächlich geöffnet ist.
Julia is surprised that the small shop is actually open in bad weather.