fetus: an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
access: a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.)