Do I need a script or a nested style to create this book layout format

For the different words in a paragraph you can use the nested style,

for the follow up with the next paragraphs use next style and different paragraph sty until you cam to the next entry, a loop of next paragraph styles.

Most anything can be scripted to format text. InDesign has lots of "hooks" that enable manual text formatting functions to be automated. Some of the scripting pros around here will be able to help; some for minimal expense, others for more.

But if you want to do this manually, or outline the steps you'd like your scripting pro to put together, nested styles would work well for you. 

You'd start with a paragraph style that uses your font family that will head your word definitions, then specify it to be bold and blue for your line/paragraph style. Nested styles will be built from your line/paragraph style:

• Part of speech (e.g. noun, adverb, adjective, etc.) specified not bold, not blue, italic and ALL CAPS
• Word variants (e.g. plurals, tenses, etc.) specified as not bold, not italic, blue again
• Phonetics (between parentheses) not blue, not bold, not italic — manually bolding emphasized syllable

The parts of speech and word variants will be easy to specify through nested styles. Part of the phoenetics —  the not blue, not bold and not italic can be defined by the nested style. Because the phoenetics are defined within parentheses, it'll be relatively easy to define the variable in your nested style with that prameter. But whether you manually use nested styles or you automate it with a script, you'll likely have to manually bold the emphasized syllable because there's no objective variable you can use to define it. That part is going to have to be done by hand.

So if you're already having to physically read, apply your judgement call for the emphasized syllable and bold it by hand, I'd suggest waiting until the proofing stage and dispense with scripting to use nested styles to make it happen. Even if you're doing it thousands of times. Since you have one manual stop, and applying the nested style is literally just two clicks anyway after you've set it up, I'd just make it part of my final proofing process and be confident of my results.

You can read more about how to construct sophisticated nested styles through this link.

Hope this helps,

Randy

@Ebere Vivian27470795a4rs 

For example: this (and more?) is possible with styles in InDesign. But for that, unfortunately, you need advanced knowledge.

What is your source? DOC, TXT, Tagged TXT, database / CMS? 

Did you cosider todo it in Adobe FrameMaker, which would be more adaptive to these styles.

For these three words?

Or for three similar words?

Or for constantly changing sets of three words?