
das Futter
feed
Food intended for animals.
Vergiss nicht, dem Hund sein Futter zu geben.
Don't forget to give the dog its feed.
feed / lining
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feed
Food intended for animals.
Vergiss nicht, dem Hund sein Futter zu geben.
Don't forget to give the dog its feed.

lining
The inner layer of fabric in clothing, bags, or curtains.
Das Futter meiner Jacke ist gerissen und muss genäht werden.
The lining of my jacket is torn and needs to be sewn.

grub / food
A colloquial and often humorous expression for food for people.
Beeilt euch, Leute, es gibt Futter!
Hurry up, guys, there's grub!

chuck
In technology, a device for clamping workpieces or tools, for example on a lathe (clamping chuck).
Der Bohrer wird fest im Futter der Bohrmaschine eingespannt.
The drill bit is clamped firmly in the chuck of the drill.
The meanings of 'Futter' are very different. But the context always makes clear what is meant: are you talking about animals (animal feed), clothing (inner fabric), food (colloquial), or tools (technical)?
Der Bauer bringt das Futter für die Kühe.
The farmer brings the feed for the cows.
In the meaning of 'Tiernahrung' (animal food/feed), 'Futter' is a very productive base word. It is often combined with a type of animal to specify the kind of food, e.g. 'Hundefutter' (dog food), 'Katzenfutter' (cat food), or 'Vogelfutter' (bird food).
Im Supermarkt gibt es eine ganze Abteilung nur für Hundefutter.
At the supermarket there is a whole section just for dog food.
When 'Futter' is used for food for people, it is always colloquial and often meant humorously. You should avoid this expression in formal situations.
Kommt schnell, das Futter wird kalt!
Come quickly, the grub is getting cold!
The meaning of 'Futter' as a holding device for tools is a technical term. You will mainly encounter it in workshops or in instructions for machines such as drills.
Bitte zieh das Futter der Drehbank fest an, bevor du die Maschine startest.
Please tighten the chuck of the lathe firmly before you start the machine.
food / nourishment
Nahrung and Futter can both refer to what an animal takes in to live and grow. Futter is the usual term for food provided to animals, while Nahrung is more general and often refers more objectively to the basis of nutrition. When giving or buying food for an animal, Futter is usually the appropriate term.

Ich stellte dem Welpen sein Futter in den Napf.
I put the puppy's food in its bowl.
Für das Wachstum des Welpen ist ausgewogene Nahrung wichtig.
A balanced diet is important for the puppy's growth.