Answer:

emulator

Answer	Crossword Clue
EMULATOR	Copy cat
EMULATOR	Computer program, perhaps
EMULATOR	Copier

EMULATOR	Rival.
EMULATOR	Rival of a sort
EMULATOR	Mimic, in computerese

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.