camping stove / case
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camping stove
A small, portable device for heating and cooking food and drinks, often used when camping or hiking.
Nach der langen Wanderung machten wir uns auf dem Gaskocher eine heiße Tasse Tee.
After the long hike, we made ourselves a hot cup of tea on the gas camping stove.
The most common meaning of 'Kocher' (camping stove) is derived from the verb 'kochen' (to cook). The ending '-er' here denotes a device or tool, so a device for cooking.
Für die Bergtour brauchen wir einen leichten und zuverlässigen Kocher.
For the mountain tour, we need a light and reliable camping stove.
The two meanings are very different. If it is about camping, hiking, or preparing food outdoors, the device is meant. If people are talking about insect larvae, streams, or biology, the protective case is meant.
Bitte fülle die Gaskartusche für den Kocher auf.
Please refill the gas cartridge for the camping stove.
In connection with the camping device, the energy sources are often mentioned, e.g. 'Gaskocher' (gas stove) or 'Spirituskocher' (alcohol stove). A typical action is 'etwas auf dem Kocher zubereiten' (to prepare something on the camping stove).
Wir haben uns auf dem Gaskocher eine Suppe warm gemacht.
We warmed up some soup on the gas camping stove.
The meaning 'Schutzhülle einer Larve' (protective case of a larva) is a technical term from zoology. You will hear this word almost only in biological texts or documentaries.
Die Form des Köchers hilft bei der Bestimmung der Insektenart.
The shape of the case helps identify the insect species.
casing / shell
'das Gehäuse' and 'der Kocher' can both mean a protective covering in small animals. 'Gehäuse' is the more general word, for example for the hard shell of a snail or mussel. In this relation, 'Kocher' means a special living and protective case made by caddisfly larvae. Learners may confuse the words because both refer to a kind of protection or covering. For snails and mussels, you normally say 'Gehäuse'; for these larvae, 'Kocher' is the more precise technical term.
Im Bach findet man manchmal den Kocher einer kleinen Larve zwischen Sand und Steinchen.
In the stream, you can sometimes find the case of a small larva among sand and little stones.
Die Schnecke zieht sich bei Gefahr in ihr Gehäuse zurück.
The snail retreats into its shell when there is danger.