high fructose corn syrup, both are super sweet
poison, both are bad for you
Death. Both can kill you. 
Murder. It causes death.
humans, both are crazy in some way.
Monkey. Both are(n’t so) smart.
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cats, both have tails and are clever.
Lynx fur coat; they both have directional fur
Ivory, they can both be ilegally collected.
porn, both are illegal in some ways
The drink; both are very addictive, but only to some people as most are fine with only mild use of either.