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One Word
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toxin
n.
1.a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species
 toxicology   toxin antitoxin   toxoid   toxoplasmosis 

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default
failure to do
As a result of her husband's failure to appear in court, she was granted a divorce by default.
defeatist defection deference
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synchronous
similary timed; simultaneous with
We have many examples of scientists in different parts of the world who have made synchronous discoveries.
synoptic synthesis synthetic
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verdigris
green coating on copper which has been exposed to the weather
Despite all attempts to protect the statue from the elements, it became coated with verdigris.
verge verisimilitude verity
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