Ruteplanleggeren viser hurtigladeren.

Because both nouns are in the definite singular form.

In Norwegian, the is usually attached to the end of the noun instead of being a separate word:

• en ruteplanlegger = a route planner

• ruteplanleggeren = the route planner

• en hurtiglader = a fast charger
• hurtigladeren = the fast charger

So the ending -en here works like English the.

Norwegian normally uses a suffix for definiteness rather than a separate article before the noun.

So instead of saying something like the route planner, Norwegian usually says:

• ruteplanleggeren

and instead of the fast charger:

• hurtigladeren

A separate determiner like den is only used in certain situations, especially with adjectives:

• hurtigladeren = the fast charger
• den hurtige laderen = the fast charger / the quick charger

So in your sentence, the simple suffixed definite form is the normal choice.

In this sentence, ruteplanleggeren is the subject and hurtigladeren is the object.

A big clue is word order:

• Ruteplanleggeren = comes first, so it is the thing doing the action
• viser = the verb
• hurtigladeren = comes after the verb, so it is the thing being shown

So the structure is:

• Ruteplanleggeren = subject
• viser = verb
• hurtigladeren = object

This is the normal Norwegian pattern for a basic statement: Subject + Verb + Object.

Viser is the present tense of å vise.

• å vise = to show
• viser = shows / is showing

In Norwegian, the present tense is often made by adding -r to the infinitive:

• vise → viser
• lade → lader
• planlegge → planlegger

So Ruteplanleggeren viser hurtigladeren uses the normal present tense.

Yes, both are compound nouns, which are extremely common in Norwegian.

ruteplanleggeren

This can be broken down as:

• rute = route
• planlegger = planner
• -en = the

So: ruteplanleggeren = the route planner

hurtigladeren

This can be broken down as:

• hurtig = fast
• lader = charger
• -en = the

So: hurtigladeren = the fast charger

A useful rule: in Norwegian compounds, the last part is usually the main noun, and the earlier part(s) describe it.

Both ruteplanlegger and hurtiglader are normally common gender nouns, which is why they take:

• en in the indefinite singular
• -en in the definite singular

So:

• en ruteplanlegger → ruteplanleggeren
• en hurtiglader → hurtigladeren

Yes, gender matters, because it affects the article and the definite ending. If a noun were neuter, you would usually get:

• et in the indefinite singular
• -et in the definite singular

Yes.

Your sentence uses definite nouns:

• Ruteplanleggeren viser hurtigladeren.
• the route planner shows the fast charger

If you wanted indefinite nouns, you would say:

• En ruteplanlegger viser en hurtiglader.

That means:

• a route planner shows a fast charger

So the sentence changes depending on whether you mean a specific route planner/charger or a non-specific one.

Yes. This is a very normal main clause word order:

• Subject + Verb + Object

So:

• Ruteplanleggeren = subject
• viser = verb
• hurtigladeren = object

Norwegian also follows the V2 rule in main clauses, meaning the finite verb is usually in the second position. In your sentence, the subject comes first, so the verb naturally comes second.

For example:

• Ruteplanleggeren viser hurtigladeren.
• I appen viser ruteplanleggeren hurtigladeren.

In the second example, I appen takes first position, so the verb viser still stays in second position.

It can mean either in general, but in a sentence like this, it most naturally means displays or shows on a screen/app/map.

So with ruteplanleggeren, many learners should understand viser as something like:

• shows
• displays
• indicates

That is a very common use of vise in Norwegian.

The main stress in Norwegian compounds usually falls on the first part of the compound.

So you would typically hear stress roughly like this:

• RU-teplanleggeren
• HUR-tigladeren

And the verb viser is usually less stressed than the nouns in a neutral sentence.

A rough English-friendly guide might be:

• ROO-teh-plan-leg-ger-en
• VEE-ser
• HUR-tig-lah-der-en

This is only approximate, but it helps with rhythm: the compounds are long words, and the first element usually carries the strongest stress.