Pavimentarius pavimentum parat.

In Pavimentarius pavimentum parat, pavimentarius is the subject and pavimentum is the direct object.

You can tell from the endings:

• pavimentarius ends in -us, a very common nominative singular ending for a masculine second-declension noun
• pavimentum ends in -um, which here is accusative singular, the usual case for a direct object

So the sentence means that the floor-layer / pavement-worker is doing the action, and the floor / pavement is what is being prepared.

Parat is a verb form from parare, meaning to prepare.

Its grammar is:

• third person singular
• present tense
• active voice
• indicative mood

So it means he prepares, she prepares, or it prepares, depending on the subject.
Since the subject here is pavimentarius, it means he prepares.

They belong to different noun patterns and are in different cases.

• pavimentarius is a masculine noun in the nominative singular, so -us is expected
• pavimentum is a neuter noun in the accusative singular

Also, neuter second-declension nouns often have:

• nominative singular: -um
• accusative singular: -um

So for a neuter noun like pavimentum, the nominative and accusative singular look the same.

Here it is being used as a noun, meaning something like floor-layer, pavement-worker, or tiler depending on context.

However, a word ending in -arius can often be related to an occupation or role, and forms like this may historically come from or resemble adjectives. In this sentence, though, you should treat pavimentarius as the person doing the action.

Latin normally has no articles.

So pavimentarius can mean:

• a floor-layer
• the floor-layer

And pavimentum can mean:

• a floor
• the floor

The exact choice in English depends on context. Latin often leaves that unstated.

Yes. Latin word order is more flexible than English because the endings already show each word’s job.

So all of these would still mean essentially the same thing:

• Pavimentarius pavimentum parat
• Pavimentum pavimentarius parat
• Parat pavimentarius pavimentum

That said, word order can affect emphasis.
The original order is a straightforward, neutral way to say it.

Yes. They are clearly related in meaning and form.

• pavimentum = floor, pavement
• pavimentarius = a person connected with floors or pavements, so floor-layer or pavement-worker

This is a common feature in Latin: related words are often built from the same base.

Pavimentarius is a second-declension masculine noun.

Its nominative singular ends in -us, which is the usual sign of that pattern.
So you would expect forms like:

• nominative singular: pavimentarius
• accusative singular: pavimentarium
• genitive singular: pavimentarii

That helps you recognize its role in sentences.

Pavimentum is a second-declension neuter noun.

Neuter second-declension nouns have some important patterns:

• nominative singular: -um
• accusative singular: -um
• nominative plural: -a
• accusative plural: -a

So in this sentence pavimentum is singular, and its role as the object is understood from context and syntax.

A simple classroom pronunciation would be something like:

pa-vee-men-TAH-ree-us pa-vee-MEN-tum PA-rat

If you are using a more classical pronunciation, keep in mind:

• v is pronounced like w
• c and g are always hard, though there are none here that cause trouble
• t stays a clear t

So in a more classical style, pavimentarius would sound closer to pa-wi-men-TA-ri-us.

Because Latin verbs already include the subject information in their endings.

In parat, the ending -t tells you the verb is third person singular. So the idea of he/she/it is already built into the verb.

That means Latin often does not need a separate subject pronoun unless it wants extra emphasis.
So Latin says simply parat, where English usually needs he prepares or she prepares.