clone vs knockoff

clone and knockoff both are nouns.

Word	Noun	Adjective	Verb	Adverb
clone	Yes	No	Yes	No
knockoff	Yes	No	No	No

As nouns, clone and knockoff are synonyms defined as:

clone (noun)	knockoff (noun)
an unauthorized copy or imitation	an unauthorized copy or imitation
a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction
a person who is almost identical to another

clone (verb)	knockoff (verb)
make multiple identical copies of