This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To cause to be excessively crowded: a system of consolidation that only overcrowded the classrooms.

verb-intransitive. To crowd together excessively.

v. To fill beyond desired limits, with people, animals, objects or information.

v. To crowd too much.

To fill or crowd to excess, especially with human beings.

v. cause to crowd together too much

v. crowd together too much

"They do not "overcrowd" and their value in the workplace is not any less than their male colleagues."

overcrowded    overcrowding    overcrowds   

crowd together    crowd   

Loud    Macleod    Mcleod    allowed    aloud    avowed    bowed    browed    cloud    cowed