They while their evenings with books and games. Here, 'while' is-

• They while their evenings with books and games. Here, 'while' is- Verb
- তারা তাদের সন্ধ্যাগুলো বই আর খেলাধুলা নিয়ে কাটায়।

• While (away)
- English Meaning: to cause to pass, especially without boredom or in a pleasant manner —usually used with away.
- Bangla Meaning: (while something away) ছুটির মেজাজে (সময়) অতিবাহিত করা।

- যেমন: They while away the time.

• While শব্দটি বিভিন্ন parts of speech হিসেবে ব্যবহৃত হতে পারে।
- While (noun): Stay here for a while. (এখানে কিছুক্ষণ থাকো।)
- While (conjunction): It is easy for an expert, while it is dangerous for a novice.
- While (preposition): Father will be happy while dinner time.

Source:
1. Accessible Dictionary by Bangla Academy.
2. Cambridge Dictionary.
3. Merriam-Webster Dictionary.