Feribot terminali sabah açılıyor.

Because feribot terminali is a Turkish noun compound meaning ferry terminal.

In this kind of compound:

• the first noun modifies the second noun
• the second noun usually takes the 3rd person possessive suffix: -(s)i / -(s)ı / -(s)u / -(s)ü

So:

• feribot = ferry
• terminal = terminal
• feribot terminali = ferry terminal

This does not mean the terminal of the ferry in a fully literal English sense. It is just the normal Turkish way to make many noun-noun combinations.

Similar examples:

• otobüs durağı = bus stop
• tren istasyonu = train station
• şehir merkezi = city center

So terminali here is completely normal.

Turkish usually puts the modifying noun first, followed by the main noun.

So the order is:

• feribot terminali = ferry terminal
• literally something like ferry terminal

This is similar to English compounds like:

• school bus
• coffee cup
• city center

The second noun is the main thing, and the first noun describes what kind of thing it is.

Here sabah means in the morning or morningtime.

A useful thing to know is that Turkish often uses time words without a preposition like in, at, or on.

So:

• sabah = in the morning / morning
• akşam = in the evening
• gece = at night
• bugün = today

In this sentence, sabah works as a time expression telling you when the terminal opens.

Turkish does not have a direct equivalent of the English definite article the.

So Turkish often leaves definiteness to be understood from:

• context
• word order
• general meaning

That means:

• feribot terminali can mean the ferry terminal or just a ferry terminal, depending on context

In this sentence, English naturally uses the ferry terminal, but Turkish does not need a separate word for the.

Açılıyor comes from the verb açılmak, which means to open in the sense of to open up / to become open.

Breakdown:

• açıl- = open, be opened, open up
• -ıyor = present continuous marker

So açılıyor can mean:

• is opening
• opens
• sometimes is being opened, depending on context

In this sentence, the natural meaning is:

• The ferry terminal opens in the morning
• or The ferry terminal is opening in the morning

Because açıyor and açılıyor come from different verbs:

• açmak = to open something
  
  • Kapıyı açıyor. = He/She is opening the door.
• açılmak = to open / be opened
  
  • Kapı açılıyor. = The door is opening / being opened.

In your sentence, the terminal is not opening something else. The terminal itself is the thing that opens. So Turkish uses açılmak:

• Feribot terminali sabah açılıyor.

That is why açılıyor is correct here.

It can potentially suggest more than one of these in different contexts, but here the most natural meaning is:

• opens in the morning

Turkish -iyor often covers meanings that English splits into several forms:

• present action: is opening
• regular/habitual situation: opens
• scheduled/near-future event: is opening

In this sentence, since it sounds like a general fact or schedule, English usually translates it as:

• The ferry terminal opens in the morning.

This is very common in Turkish.

The -iyor form is not only for actions happening right now. It is also often used for:

• current situations
• regular/habitual actions
• scheduled events
• near future events

So Turkish may say:

• Okul saat sekizde başlıyor. = School starts at eight.
• Tren akşam geliyor. = The train arrives in the evening.

Likewise:

• Feribot terminali sabah açılıyor.

So even though English uses the simple present opens, Turkish naturally uses açılıyor.

Yes, somewhat. Turkish word order is flexible, though the verb usually stays at the end.

The neutral order here is:

• Feribot terminali sabah açılıyor.

You could also say:

• Sabah feribot terminali açılıyor.

Both are possible, but they may shift emphasis slightly:

• Feribot terminali sabah açılıyor. = neutral statement
• Sabah feribot terminali açılıyor. = puts a little more focus on in the morning

The verb açılıyor normally stays at the end.

Yes. The subject is feribot terminali.

The sentence structure is basically:

• Feribot terminali = subject
• sabah = time expression
• açılıyor = verb

So the sentence means that the ferry terminal is the thing that opens, and sabah tells you when.

Yes, it is possible, but it feels a bit different.

• açılıyor sounds very natural for schedules, routines, and current factual situations
• açılır can sound more like a general rule, formal statement, or habitual fact

So:

• Feribot terminali sabah açılıyor. = very natural in everyday speech
• Feribot terminali sabah açılır. = possible, but less conversational in many contexts

A learner will hear -iyor very often in sentences like this.