Flyttelasset fyller flyttebilen.

Those are the definite endings in Norwegian.

• flyttelasset = the moving load
• flyttebilen = the moving truck/van

Unlike English, Norwegian often puts the at the end of the noun instead of using a separate word.

Here, the base nouns are:

• et lass → lasset = the load
• en bil → bilen = the car/truck/vehicle

Because these are compounds, the endings go on the last part of the compound:

• flyttelass → flyttelasset
• flyttebil → flyttebilen

Because the two nouns have different grammatical genders.

• lass is neuter: et lass → lasset
• bil is common gender: en bil → bilen

In Norwegian compounds, the last element decides the gender of the whole word.

So:

• flyttelass behaves like lass
• flyttebil behaves like bil

That is why one becomes flyttelasset and the other becomes flyttebilen.

In this sentence, word order tells you.

• Flyttelasset = subject
• fyller = verb
• flyttebilen = object

So the sentence means that the moving load fills the moving truck, not the other way around.

Norwegian does not usually mark subject and object with special case endings the way some other languages do, so position in the sentence matters a lot.

Flyttelass is a compound noun:

• flytte = move / moving
• lass = load

So flyttelass means a load of belongings being moved, especially in the context of changing homes.

It is a very natural Norwegian word. It does not refer to the act of moving itself, but to the stuff being transported.

It can mean a moving vehicle used for a move, so in English the best translation depends on context:

• moving van
• moving truck
• sometimes just removal van

The Norwegian word itself is broader than one fixed English option. Bil literally means car, but in compounds it can refer to a road vehicle more generally.

Because fyller is the active verb fills.

• Flyttelasset fyller flyttebilen. = The moving load fills the moving truck.
• Flyttebilen er full av flyttelasset. = The moving truck is full of the moving load.

These are similar in meaning, but the structure is different:

• fyller focuses on the action/result: one thing fills another
• er full av describes a state: something is full of something

In this sentence, flytte- is being used as the first part of a compound noun.

You can think of it as coming from the verb å flytte = to move, but inside the compound it functions more like a descriptive element:

• flyttelass = moving-load
• flyttebil = moving-vehicle

This is very common in Norwegian. A verb stem is often used to form compounds.

Because Norwegian usually expresses definiteness with a suffix, not a separate article.

So instead of:

• the truck

Norwegian often uses:

• bilen

And instead of:

• the load

Norwegian uses:

• lasset

In compounds, the same thing happens:

• flyttebilen
• flyttelasset

A separate determiner can appear too in some structures, but not in this simple sentence.

Yes. In Norwegian, compound nouns are normally written as one word.

So these are correct:

• flyttelass
• flyttebil

Writing them as separate words would usually look wrong or unnatural in standard Norwegian.

This is a very important habit for English speakers, because English often uses separate words where Norwegian prefers compounds.

It is the present tense of å fylle = to fill.

• infinitive: å fylle
• present tense: fyller

This is a very common pattern in Norwegian:

• å komme → kommer
• å snakke → snakker
• å fylle → fyller

So Flyttelasset fyller flyttebilen is in the present tense.

Yes, but the basic version here is the most straightforward: subject + verb + object.

You could front another element in other kinds of sentences, but then Norwegian follows the V2 rule: the verb still stays in second position.

For example, if you added a time expression:

• I dag fyller flyttelasset flyttebilen.

Here, I dag comes first, but fyller still stays in second position.

In the original sentence, though, the normal order is simply:

• Flyttelasset
  • fyller
    • flyttebilen

A few useful pronunciation points:

• y in fyller and flytte- is not like English y. It is a front rounded vowel that many English speakers find difficult at first.
• tt in flytte shows that the preceding vowel is short.
• The r at the end of fyller is often clearly pronounced, depending on dialect.

A rough learner-friendly approximation might be:

• FLYT-teh-lahs-set FYL-ler FLYT-teh-bee-len

That is only approximate, but it can help you get started.

It is understandable and grammatical, and it sounds quite natural as a descriptive sentence.

It may feel a little textbook-like because both nouns are long compounds from the same topic, but a Norwegian speaker could absolutely say it in the right context, for example when talking about loading a truck during a move.

It is also a good practice sentence because it shows several useful features at once:

• compound nouns
• definite endings
• present tense verb
• normal word order

You would remove the definite endings and add the indefinite articles if needed:

• Et flyttelass fyller en flyttebil.

That means A moving load fills a moving truck.

Compare:

• Flyttelasset fyller flyttebilen. = The moving load fills the moving truck.
• Et flyttelass fyller en flyttebil. = A moving load fills a moving truck.

So the original sentence is talking about specific things, not just any moving load and any truck.