司し会かい者しゃ

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Meanings

Refers to the person who leads or facilitates a meeting, event, panel, or broadcast. Covers roles from formal chairperson to TV show host.

〈人ひと〉が司し会かい者しゃを務つとめるfor someone to serve as the MC/moderator
今日きょうのパーティーは田た中なかさんが司し会かい者しゃを務つとめます。
Tanaka will be the MC at today's party.
〈人ひと〉を司し会かい者しゃに指し名めいするto appoint someone as the moderator/chairperson
会かい議ぎでは山やま田ださんを司し会かい者しゃに指し名めいした。
At the meeting, Yamada was appointed as the chairperson.
司し会かい者しゃの指し示じに従したがうto follow the moderator's/MC's instructions
参さん加か者しゃは司し会かい者しゃの指し示じに従したがって発はつ言げんした。
The participants spoke following the moderator's instructions.

議ぎ長ちょうN3
議長 is used specifically for the chairperson of a formal meeting or assembly, while 司会者 is the broader term covering event hosts, panel moderators, and TV MCs.
モデレーター
モデレーター is a borrowed term used mainly for the moderator of a panel discussion or debate, whereas 司会者 is the everyday Japanese word covering that role and many others.
ホスト
ホスト is a casual, often TV/entertainment-specific word for the person hosting a show or party, while 司会者 is the neutral term usable in formal and informal settings alike.
ＭＣ
司会者 is the standard, slightly formal Japanese word for a moderator or host, while ＭＣ is the casual loanword used especially for concerts, TV, and live events.

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ナビゲーター
司会者 is the standard word for an MC who mainly keeps an event running smoothly, while ナビゲーター in the media sense suggests a more explanatory, guiding presence.
ホステス
ホステス (as a TV role) specifically means a female presenter, while 司会者 is a gender-neutral word for the host or emcee of a program or event.
アナウンサーN4
司会者 is a general word for an MC or chairperson at any event, whereas アナウンサー specifically implies a trained broadcaster employed by a station.

司し会かいN3
司会 properly names the act of emceeing/chairing (and is often used loosely to mean the person doing it), while 司会者 unambiguously names the person in that role.
会かい長ちょうN1
会長 is the head or president of an organization or club, a leadership title distinct from 司会者, who merely runs a specific meeting or event.
ホスト
ホスト is the person who hosts or owns an event, while 司会者 is specifically the emcee who moderates or runs the proceedings.

名めいN2
More formal than 人 — used for headcounts in reservations, staff lists, and announcements (5名様).
人にん
The everyday counter for people: 一人 (ひとり), 二人 (ふたり), 三人 (さんにん).

Compound of 司会 (emceeing, chairing) + 者 (person).