Nava este mare.

Because -a at the end is the definite article in Romanian.

• navă = a ship
• nava = the ship

Romanian usually puts the definite article at the end of the noun, unlike English, which puts the before the noun.

So nava este mare literally means the ship is big.

The basic noun is navă. When you add the definite article, it becomes nava.

This is a normal pattern for many feminine nouns in Romanian:

• casă → casa = the house
• masă → masa = the table
• navă → nava = the ship

So the final ă often changes to a when the definite article is added.

Yes. Este means is.

It comes from the verb a fi = to be.

Here are some common forms:

• eu sunt = I am
• tu ești = you are
• el/ea este = he/she is

So in nava este mare, este is simply the verb is.

Yes. Nava e mare is completely natural and very common in everyday Romanian.

• este = fuller form
• e = shorter form

Both mean is here.

So these both mean the same thing:

• Nava este mare
• Nava e mare

In Romanian, adjectives often come after the noun.

So:

• nava mare = the big ship

In the sentence Nava este mare, the adjective comes after the verb because it is part of the predicate:

• Nava = the ship
• este = is
• mare = big

This is similar to English The ship is big.

Because mare has the same form for both masculine and feminine singular in many contexts.

Examples:

• băiat mare = big boy
• navă mare = big ship

So even though navă is feminine, mare stays mare.

In the plural, it does change:

• băieți mari = big boys
• nave mari = big ships

You usually learn the noun’s gender along with the word itself, but there are clues.

Here, the singular indefinite form navă is feminine, and its definite form is nava, which matches a common feminine pattern.

Also, in the plural:

• navă → nave

That also fits a common feminine noun pattern in Romanian.

The normal, neutral word order is:

• Nava este mare.

This is the most natural way to say The ship is big.

Romanian can sometimes change word order for emphasis, but learners should stick with the standard pattern:

• subject + verb + adjective

So Nava este mare is the best basic version to learn first.

A simple approximation is NA-va.

Important points:

• na- sounds like nah
• va sounds like vah
• the stress is on the first syllable: NA-va

Also, compare:

• navă ends with ă, a short central vowel
• nava ends with a clear a

So navă and nava do not sound exactly the same.

In standard Romanian, you normally keep este or e in a sentence like this.

So you would say:

• Nava este mare.
• Nava e mare.

Leaving out the verb, as in just Nava mare, would not mean The ship is big as a full normal sentence. It would sound more like a noun phrase, such as the big ship.

They are different structures:

• nava mare = the big ship
  This is a noun phrase.
• Nava este mare = The ship is big
  This is a full sentence.

So:

• nava mare describes a ship
• Nava este mare says something about the ship

It is a real and correct Romanian word, but it is a bit more formal or specific than some other words for watercraft.

Depending on context, Romanian may also use:

• vas = vessel, ship
• barcă = boat

But navă is perfectly correct for ship/vessel, especially in more formal, technical, or nautical contexts.