Η πιατοθήκη πάνω από τον νεροχύτη είναι σχεδόν γεμάτη.

Πιατοθήκη is a noun meaning something like dish cupboard / dish rack / plate cabinet, depending on the kitchen setup.

It is a compound word:

• πιάτο = plate, dish
• -θήκη = holder, container, place for keeping something

So πιατοθήκη literally means a place where plates are kept.

Η is the definite article for a feminine singular noun in the nominative case.

So:

• η πιατοθήκη = the dish cupboard / the dish rack

Greek uses articles very often, sometimes more often than English does, so it is normal to see η here.

You can tell from both the article and the noun ending:

• η usually marks a feminine singular noun
• nouns ending in -η are very often feminine

So in this sentence:

• η πιατοθήκη = feminine singular

That matters because adjectives must agree with it.

Because adjectives in Greek must agree with the noun they describe in gender, number, and case.

The noun is:

• η πιατοθήκη = feminine singular

So the adjective must also be feminine singular:

• γεμάτη = full

Compare:

• η πιατοθήκη είναι γεμάτη = the dish cupboard is full
• ο νεροχύτης είναι γεμάτος = the sink is full
• το ποτήρι είναι γεμάτο = the glass is full

Same adjective, different endings.

Because πάνω από takes the noun in the accusative case.

The basic noun is:

• ο νεροχύτης = the sink

But after από in this phrase, it becomes:

• τον νεροχύτη

So:

• πάνω από τον νεροχύτη = above the sink

This is very common in Greek: prepositions often require a particular case, and here you see the accusative.

Yes, in this sentence it works as a unit meaning above / over.

• πάνω = up, on top
• από = from, than, by, over/above in certain combinations

Together:

• πάνω από = above, over

So:

• η πιατοθήκη πάνω από τον νεροχύτη = the dish cupboard above the sink

This whole phrase describes which dish cupboard we mean.

It is a prepositional phrase describing the noun πιατοθήκη.

It answers the question:

• Which dish cupboard?
• The one above the sink.

So the structure is:

• Η πιατοθήκη = the dish cupboard
• πάνω από τον νεροχύτη = above the sink
• είναι σχεδόν γεμάτη = is almost full

Yes. Greek word order is often more flexible than English word order.

The given sentence is completely natural:

• Η πιατοθήκη πάνω από τον νεροχύτη είναι σχεδόν γεμάτη.

But you could also say:

• Η πιατοθήκη είναι σχεδόν γεμάτη, πάνω από τον νεροχύτη.
  This is less neutral and sounds more like the location is being added afterward.

The original version is the most natural if πάνω από τον νεροχύτη is meant to identify the cupboard.

Σχεδόν means almost / nearly.

Here it modifies γεμάτη:

• σχεδόν γεμάτη = almost full

Its position before the adjective is very normal:

• είναι σχεδόν γεμάτη

You may also see σχεδόν before other words, depending on what it modifies, but here it most naturally goes before γεμάτη.

In a normal full sentence like this, yes.

• είναι = is

Greek usually keeps the verb to be in the present tense, unlike Russian or Arabic, for example. So:

• Η πιατοθήκη ... είναι σχεδόν γεμάτη. = correct standard sentence

In very informal notes, headlines, or fragmented speech, Greek may omit things, but in normal grammar you keep είναι.

Because Greek usually says the sink here, not just sink.

So:

• τον νεροχύτη = the sink

Greek commonly uses the definite article with nouns when the object is specific or understood from context. In a kitchen, the sink is a clearly identifiable thing, so the article is natural.

Yes, depending on context.

In some contexts, πιατοθήκη can mean:

• a cupboard for dishes
• a rack where dishes are stored or dried

The sentence itself does not force only one interpretation. The phrase πάνω από τον νεροχύτη makes many learners imagine a kitchen cupboard or rack mounted above the sink.

A rough pronunciation guide is:

• Η πιατοθήκη πάνω από τον νεροχύτη είναι σχεδόν γεμάτη
• ee pyato-THEE-kee PA-no a-PO ton ne-ro-HEE-tee EE-ne skhe-DHON ye-MA-tee

A few useful points:

• η sounds like ee
• θ sounds like th in think
• χ in νεροχύτη is a harsher sound, not exactly an English h
• γ before ε in γεμάτη sounds like a soft y-like sound

The sentence follows a very common pattern:

article + noun + descriptive phrase + verb + adverb + adjective

So:

• Η = the
• πιατοθήκη = dish cupboard / dish rack
• πάνω από τον νεροχύτη = above the sink
• είναι = is
• σχεδόν = almost
• γεμάτη = full

That makes it a very useful model for building similar sentences in Greek.