This is the 2415th most frequent Japanese word.
ホスト
"Host" in English, referring to a person who entertains guests or, in Japan, men working in host clubs entertaining clients.
Here, the word 'ホスト' is used to refer to a male entertainer working in a host club.
ホストクラブで働いている彼は毎晩忙しい。
He, who works at a host club, is busy every night.
In this sentence, 'ホスト' refers to the person who organizes or leads the event.
今日のパーティーのホストは田中さんです。
The host of today's party is Mr. Tanaka.
Here, 'ホスト' represents the act of hosting guests, borrowing the English terminology for the concept.