verwendbar
usable
Suitable to be used or applied for a specific purpose.
Dieser Kleber ist für Holz, aber nicht für Plastik verwendbar.
This glue is usable for wood, but not for plastic.

usable
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usable
Suitable to be used or applied for a specific purpose.
Dieser Kleber ist für Holz, aber nicht für Plastik verwendbar.
This glue is usable for wood, but not for plastic.

The adjective is formed from the verb 'verwenden' (to use) and the ending '-bar' (-able). The ending '-bar' means that something can be done — 'verwendbar' (usable) therefore literally means 'can be used'.
Diese Software ist auf fast allen Betriebssystemen verwendbar.
This software is usable on almost all operating systems.
To indicate the purpose or area of usability, the preposition 'für' (for) with the accusative is used very frequently.
Das Werkzeug ist für viele verschiedene Reparaturen verwendbar.
The tool is usable for many different repairs.
In connection with food, drinks, or medication, 'verwendbar' (usable) almost always refers to the expiration date. Signal words here are often time expressions such as 'bis' (until) or 'nur noch' (only ... left/still only).
Die Milch ist nach dem Öffnen nur noch wenige Tage verwendbar.
After opening, the milk is only usable for a few more days.
suitable
'geeignet' and 'verwendbar' overlap when something can be used for a purpose. 'geeignet' is broader and evaluates whether something fits well or makes sense. 'verwendbar' more strongly says that you can use something at all. It often sounds more practical and fits well with materials, files, tools, or food. With food, 'verwendbar' can also mean that it has not gone bad yet. An object can be 'verwendbar' (usable), but still not especially 'geeignet' (suitable) for a particular task.

Die Milch ist noch verwendbar, obwohl das Datum gestern war.
The milk is still usable, even though the date was yesterday.
Diese Farbe ist für das Kinderzimmer gut geeignet.
This color is well suited for the children's room.