Upāsaka (masculine) or Upāsikā (feminine) are from the Sanskrit and Pāli words for "attendant". This is the title of followers of Buddhism who are not monks, nuns, or novice monastics in a Buddhist order, and who undertake certain vows. In modern times they have a connotation of dedicated piety that is best suggested by terms such as "lay devotee" or "devout lay follower".
The word Upāsaka (Brahmi script), used by Ashoka in his Minor Rock Edict No.1 to describe his affiliation to Buddhism (circa 258 BCE).
A bhikkhu is an ordained male in Buddhist monasticism. Male and female monastics are members of the Sangha.
Bhikkhus in Thailand
Tibetan monks
Japanese monks of Jōdo Shinshū, Sōtō, and Shingon Buddhism.
A Cambodian monk in his robes