A colony typically refers to a place where people permanently live and are colonising, e.g. setting up state structures, having children, etc.

Which could be 20 permanent residents and 10 non-permanent slots. I don't think that requires too grand of a structure.

This is splitting hairs, but I was envisaging something more like the ISS but on the moon. A far cry from the 50s/60s dream of a grill and white picket fence on the moon.