النقاش والكهربائي جاهزين.

A natural Egyptian pronunciation is:

en-naʔʔāsh wel-kahrabāʔi gāhzeen

A few useful notes:

• ج in جاهزين is usually pronounced like hard g in Egyptian Arabic, so gāhzeen, not jāhzeen
• و in والكهربائي means and and is attached to the next word
• The ال in النقاش is pronounced differently from the ال in الكهربائي because of sun/moon letter rules

Yes — this is a very common source of confusion.

Arabic often leaves short vowels unwritten, so the spelling النقاش can represent more than one word:

• النقاش = the discussion in one pronunciation
• النقاش = the painter/decorator in another pronunciation

Here, the meaning is clearly the painter/decorator, because it appears next to الكهربائي (the electrician) and the whole sentence is talking about people being ready.

So the context tells you which word is meant.

In Egyptian Arabic, النقاش usually means a house painter / decorator / finishing worker, not a fine artist.

So it is closer to:

• painter
• decorator
• house painter

If you mean someone who paints pictures or is an artist, رسّام is more likely.

Because in Arabic, the word و meaning and is written as a prefix attached to the following word.

So:

• والكهربائي = و + الكهربائي
• literally: and + the electrician

This is completely normal in Arabic writing.
You will often see conjunctions and some short particles attached like this.

Because Arabic normally marks each noun separately as definite.

So:

• النقاش = the painter
• الكهربائي = the electrician

Together:

• النقاش والكهربائي = the painter and the electrician

In other words, Arabic does not usually use one ال to cover both nouns at once. Repeating it is the normal pattern.

There is no separate word for are here, because Arabic usually leaves out the present-tense verb to be.

So:

• النقاش والكهربائي جاهزين
• literally: the painter and the electrician ready
• natural English: The painter and the electrician are ready

This is called a nominal sentence.
In present-time statements, Arabic often says X ready, X tired, X here, etc., without a word for is / are.

Because the subject is more than one person: the painter and the electrician.

• جاهز = ready for one masculine person
• جاهزين = ready for a masculine plural group, and this is the normal form you hear in Egyptian for a coordinated subject like this

So:

• النقاش جاهز = The painter is ready
• النقاش والكهربائي جاهزين = The painter and the electrician are ready

In everyday Egyptian Arabic, using جاهزين here is the natural choice.

This is because of the sun letter / moon letter rule.

• ن in النقاش is a sun letter, so the ل of ال is not pronounced separately. The sound blends in:
  • النقاش → en-naʔʔāsh
• ك in الكهربائي is a moon letter, so the ل is pronounced:
  • الكهربائي → el-kahrabāʔi

That is why the beginning sounds different in the two words, even though both start with ال in writing.

It is an adjective meaning ready.

In this sentence, it works as the predicate:

• النقاش والكهربائي = the subject
• جاهزين = what is being said about them

So structurally, the sentence is:

• The painter and the electrician
  • ready

In English you need are, but in Arabic the adjective can stand directly as the predicate in the present tense.