
der Entwurf
draft
A preliminary, not yet final version of a text, plan, or concept.
Ich schicke Ihnen den ersten Entwurf des Vertrags zur Prüfung.
I will send you the first draft of the contract for review.
draft / design
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draft
A preliminary, not yet final version of a text, plan, or concept.
Ich schicke Ihnen den ersten Entwurf des Vertrags zur Prüfung.
I will send you the first draft of the contract for review.

design / sketch
A drawn or creative sketch for a building, an item of clothing, a work of art, or a design object.
Die Architektin präsentierte ihren Entwurf für das neue Rathaus.
The architect presented her design for the new town hall.
'Der Entwurf' (the draft/design) is the noun form of the verb 'entwerfen' (to design/draft). You can recognize the verb 'werfen' (to throw) in it. The idea behind it is that you 'throw out' a first thought or first sketch, or put it down on paper.
Der Künstler entwirft gerade eine neue Skulptur.
The artist is currently designing a new sculpture.
Common verbs used with 'Entwurf' (draft/design) are 'einen Entwurf erstellen' (to create a draft), 'einen Entwurf anfertigen' (to produce a draft), 'einen Entwurf überarbeiten' (to revise a draft), and 'einen Entwurf präsentieren' (to present a draft/design).
Der Minister muss den Entwurf für das neue Gesetz noch überarbeiten.
The minister still has to revise the draft for the new law.
With texts and plans, 'Entwurf' (draft) is often combined with adjectives such as 'erster' (first), 'vorläufiger' (preliminary), or 'grober' (rough). It is also part of compounds such as 'Gesetzesentwurf' (draft bill) or 'Vertragsentwurf' (draft contract).
Bitte lesen Sie den ersten Entwurf des Berichts und geben Sie mir Feedback.
Please read the first draft of the report and give me feedback.
plan
For a building, Entwurf can show the design idea in the form of a sketch. Plan, by contrast, represents the intended structure schematically. If the aim is to present what it will look like first, Entwurf is appropriate; for the specific spatial arrangement, Plan is more suitable.

Der Entwurf zeigt die geplante Form und Gestaltung des neuen Hauses.
The design shows the planned shape and appearance of the new house.
Der Plan zeigt die genaue Anordnung der Räume im neuen Haus.
The plan shows the exact arrangement of the rooms in the new house.