• 'Syntax' means- Sentence building.

• Syntax (noun)
English Meaning: the way in which linguistic elements (such as words) are put together to form constituents (such as phrases or clauses)/ the part of grammar dealing with this.
Bangla Meaning: বাক্যপ্রকরণ; বাক্যরীতি; পদান্বয়; পদযোজনা।

Source:
1. Merriam-webster.
2. Accessible Dictionary by Bangla Academy.

Officialese

English meaning: the type of language, often used in government documents, that is formal and often difficult to understand/ language used in official documents that is thought by many people to be too complicated and difficult to understand.
Bangla meaning: আমলাদের লেখায় ব্যবহৃত (অতিরিক্ত কেতাবি বা দুর্বোধ্য) ভাষা।

Example: 
- The pompous impersonality of officialese also, of course, allows the civil servant to hide behind the monolithic structure of his organisation.

Correct answer: The word 'officialese' means - language used in offices.

Source: Cambridge Dictionary.