Noun

• S: (n) ringer, dead ringer, clone (a person who is almost identical to another)
• S: (n) clone, clon (a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction)
• S: (n) knockoff, clone (an unauthorized copy or imitation)

Verb

• S: (v) clone (make multiple identical copies of) "people can clone a sheep nowadays"