I noticed the other day that sanga was accepted, but not sangha. Unless sanga means something entirely different that I never heard of, I think sangha is the more accepted spelling.
Wikipedia:
Sangha (संघ saṃgha) is a word in Pali or Sanskrit that can be translated roughly as "association" or "assembly" or "community". It is commonly used in several senses to refer to Buddhist or Jain groups. Traditionally, in Buddhism sangha almost always has one of two meanings: most commonly, sangha means the monastic sangha of ordained Buddhist monks or nuns. In a stricter sense, sangha can mean the assembly of all beings possessing some high degree of realization, referred to as the arya-sangha or noble sangha.
