reachable

/R IY1 CH AH0 B AH0 L/
noun
  1. 1

    Someone or something that can be reached.

adjective
  1. 1

    Within easy reach; accessible

  2. 2

    (of a node) That may be reached from another node in a graph by passing along one or more lines

Antonyms

Source: https://en.wiktionary.org/wiki/reachable