This beginning of this verse demonstrates how Jesus builds tension in this storytelling, initially misleading his listeners about which son he is talking about. The verse uses two unique words and one of them may have been chosen for a double meaning, which while very common in Jesus's saying, is somewhat uncommon in his stories. 

The Greek word translated as "not" means "but", "however", and "on the other hand". Since it always falls in the second position, translating it as "however" often captures its feeling better.  It is not the Greek word for "now". 

The word translated as "his" is the Greek word commonly translated as third-person pronouns in English.  Here, it follows the noun, "that son of his". It can be used before the noun. 

The word translated as "elder" is a comparative like our "elder" or "older".  It appears after the noun and after the "his", so Jesus's listeners would already be thinking of the prodigal son before this word comes out as a reveal.  The word also means "the most important", which was certainly true of eldest sons.  

The word translated as "son" more generally means "child" or "children". 

The verb "was" here is the common form of "to be" in Greek. It means to have a certain characteristic or remain in a certain condition. It also equates terms or assigns characteristics. It begins the verse as "he was", so it leads the listeners to this of the younger son. 

The word translated as "in" also means "within", "with," or "among."

"Field" is from the common noun that means "field", "lands," or "countryside."  Notice how this phrase comes after the reveal that this is the oldest son. Beginning the sentence with "in the field" would have provided context for the rest, which is the proper way to write Greek, with the context first. Jesus doesn't do that intentionally to create surprises in his stories.

The Greek word translated as "and" is used as the conjunction "and", but it also is used to add emphasis ("also"). In a series, it is best translated as "not only...but also." After words implying sameness "as".

The word translated as "as" has a very broad meaning, translating as "how", "when", "where", "just as", "like," and related words.  Here "when" fits best.

The word translated as "come" primarily means "to start out" but Christ usually uses it to mean "come" but not always.  Our English word "show up" captures both the "start" and "come" ideas.  Here, "coming out" fits the context. The form is an adjective, not an active verb. 

There is no "and" here. It is added because the KJV translators made the previous verb active when it is really an adjective. 

The word translated as "drew nigh" is the verb form of an adverb "near" in space, time, and relationships. In English, we would say "nears" or, in the form here, "neared". This word appears only in the Gospel. It was created in the same way we would add "-lize" to a noun as "stylize" is created from "style." Jesus creates verbs in a similar way in Greek. 

The Greek word translated as "to the house," refers to the building itself, all the people that dwell in it, but Jesus uses the form here (female) to refer to the building itself. The "to" comes from the form, which is an indirect object. 

"He heard" is from a Greek verb that means "to hear" and "to listen." It has the same sense as the English not only of listening but of understanding.

"Music" is a Greek noun used by Jesus only here. It means "concord or unison of sound", "musical concord", "harmony", "agreement", " band", and "orchestra".  It is not the Greek word from music. Here, it would probably be heard as both "a band" and "harmony" in the sense of agreement. The form is possessive, but it works as an object here (the objective genitive". 

The Greek word translated as "and" is used as the conjunction "and", but it also is used to add emphasis ("also"). 

"Dancing" is a Greek noun used by Jesus only here. It means "dance", "choir", "dancers and singers", and "place for dancing". The sense here is "a dance". The form is possessive, but it works as an object here (the objective genitive".