CROWD, THRONG, HORDE, CRUSH, MOB mean an assembled multitude.

CROWD implies a close gathering and pressing together.

e.g. a crowd gathered

THRONG and HORDE suggest movement and pushing.

e.g. a throng of reporters a horde of shoppers

CRUSH emphasizes the compactness of the group, the difficulty of individual movement, and the attendant discomfort.

e.g. a crush of fans

MOB implies a disorderly crowd with the potential for violence.

e.g. an angry mob

a large crowd of people, especially one that is disorderly and intent on causing trouble or violence:

〖集合的に; ｟英｠ では単複両扱い〗(無秩序で暴力的な)群衆, 暴徒; やじ馬

e.g. a mob of protesters.

(usually the Mob) North American the Mafia or a similar criminal organization.

｟くだけて｠ 〖通例the M-; 単数扱い〗マフィア(the Mafia); ギャング［暴力］団 (!それぞれの団員はmobster) .

(the mob) the ordinary people:

｟古･けなして｠ ; 〖the ～〗 (教育を受けていない貧しい)大衆, 愚民(the masses).

e.g. the age-old fear that the mob may organize to destroy the last vestiges of civilized life.

verb (mobs, mobbing, mobbed) with object

crowd around (someone) in an unruly and excitable way in order to admire or attack them:

〖通例be ～bed〗 〈人が〉 «…に» 取り囲まれる, もみくちゃにされる; 襲われる «by»

e.g. he was mobbed by autograph hunters.

(of a group of birds or mammals) surround and attack (a predator or other source of threat) in order to drive it off:

〈鳥･動物の大群が〉〈別の鳥･動物〉を取り囲んで襲う.

e.g. a cuckoo flew over, to be mobbed at once by two reed warblers

e.g. (as noun mobbing) : small mammals may indulge in mobbing to rid themselves of a feared killer.

crowd into (a building or place):

｟米｠ ; 〖通例be ～bed〗 〈場所が〉 【大勢の人で】埋め尽くされる, いっぱいである «with» .

e.g. an unruly crowd mobbed the White House during an inaugural reception.

mobber noun

late 17th century: abbreviation of archaic mobile, short for Latin mobile vulgus ‘excitable crowd’.