It feels to me, as a newer user of OACS, that subsite is more descriptive and useful to learning/using OACS. "subsite" is a subset of "community" ... community does not convey much information to new OACS admins/developers/users. At least to me, I would be looking for more descriptive, technical terms that convey more, not less, (abstract) information. "community" in this sense almost sounds more like marketing jargon is creeping into tech docs;(
