【Crowd】 , 【throng】 , 【press】 , 【crush】 , 【mob】 , 【rout】 , 【horde】  are comparable when they mean a more or less closely assembled multitude usually of persons.

【Crowd】 basically implies a close gathering and pressing together. It often implies a merging of the individuality of the units into that of the mass.

【Throng】 varies so little in meaning from 【crowd】 that the two words are often used interchangeably without loss. 【Throng】 sometimes carries the stronger implication of movement and of pushing and the weaker implication of density.

【Press】  differs from 【throng】 in being more often applied to a concentrated mass in which movement is difficult because of the numbers, but otherwise it also suggests pushing or pressing forward.

【Crush】  carries a stronger implication than either 【crowd】 or 【throng】  of compactness of the group, of offering difficulty to one who wishes to make his way through it, or of causing discomfort to one who is part of it.

【Mob】 strictly applies to a 【crowd】 or 【throng】  bent on the accomplishment of riotous or destructive acts.

Especially in the United States and in Australia 【mob】  may be employed as an intensive of 【crowd】 , sometimes implying more disorganization, but at other times denoting merely an extremely large 【crowd】 .

In theatrical use 【mob】  applies to any large and manifestly agitated 【crowd】 of persons that has to be directed as a unit to achieve the proper or the intended effects.

【Rout】 applies to an especially disorderly or tumultuous 【mob】 .

【Horde】  usually applies to an assemblage or to a multitude massed together. It is sometimes preferred to 【crowd】 , 【throng】 ,  【mob】 , or 【rout】 when a contemptuous term is desired, especially one that suggests the rude, rough, or savage character of the individuals who constitute the multitude or mass.