This is the 8995th most frequent Japanese word.
泊り
"泊り" means "staying overnight" or "lodging."
Here, '泊まりました' is used to denote the act of staying overnight at a place, which is its common usage.
私は友達の家に泊まりました。
I stayed overnight at a friend's house.
In this sentence, '泊まる' is used to reference the action of staying overnight at an accommodation, referring to the service offered by the inn.
この旅館では一泊から泊まることができます。
You can stay overnight starting from one night at this inn.
Here, '泊まる' is utilized to describe someone's planned action to stay at a specific place during a business trip.