Formal:
* Greeting: (a formal way to acknowledge someone's arrival)
* Receive: (to accept someone or something)
* Acknowledge: (to recognize and show that you have noticed someone's presence)
* Extend a cordial invitation: (to invite someone in a friendly way)
* Offer hospitality: (to provide someone with food, drink, and a place to stay)
Informal:
* Glad to see you: (expresses happiness at someone's arrival)
* Delighted to have you: (shows enthusiasm for someone's presence)
* So good to see you: (a casual way to express happiness)
* Great to see you: (another casual way to express happiness)
* Happy to see you: (a straightforward way to express happiness)
Other:
* Awaiting your arrival: (implies anticipation for someone's arrival)
* Looking forward to your visit: (expresses enthusiasm for someone's upcoming arrival)
* Please make yourself at home: (invites someone to relax and be comfortable)
* Feel free to: (gives someone permission to do something)
* Don't hesitate to: (encourages someone to do something)
* Come in, come in: (a friendly invitation to enter)
* We're so happy you're here: (expresses joy at someone's presence)
* You're most welcome: (emphasizes the joy of someone's arrival)
The best word to use will depend on the context of the situation.