Formal:
* আপুনি স্বাগতম (Aapuni swagatam) - This is the most formal way to say welcome, literally meaning "You are welcome".
* স্বাগতম (Swagatam) - This is a shorter and still formal way to say welcome.
Informal:
* আহিব (Ahib) - This literally means "Come in" and is used as a casual welcome.
* সূচি (Suci) - This is a more colloquial way to say welcome, literally meaning "welcome".
* অভিনন্দন (Abhinandan) - This means "congratulations" but can also be used as a casual welcome.
Other options:
* আপুনি আহিব (Aapuni ahib) - "You come in". This is a polite and informal way to welcome someone.
* আহিব, সুখে থাকিব (Ahib, sukhe thakibo) - "Come in, be happy". This is a friendly and welcoming phrase.
The best choice for you will depend on the specific situation.