copycat vs emulator

copycat and emulator both are nouns.

Word	Noun	Adjective	Verb	Adverb
copycat	Yes	No	No	No
emulator	Yes	No	No	No

As nouns, copycat and emulator are synonyms defined as:

copycat and emulator: someone who copies the words or behavior of another

Other synonyms of copycat include ape, aper, imitator.

copycat (noun)	emulator (noun)
someone who copies the words or behavior of another	someone who copies the words or behavior of another