109. Caustic, Corrosive

Caustic: Able to burn or destroy
Corrosive: Eating away gradually

110. Censure, Condemn

Censure: Express severe disapproval
Condemn: Declare wrong

111. Chicanery, Trickery

Chicanery: Deceptive practices
Trickery: Deception or cheating

112. Circumspect, Cautious

Circumspect: Careful to consider risks

113. Cogent, Convincing

Cogent: Clear and persuasive
Convincing: Believable

114. Complacent, Smug

Complacent: Self-satisfied
Smug: Excessively pleased with oneself

115. Conflagration, Blaze

Conflagration: Large, destructive fire
Blaze: Strong fire

116. Connoisseur, Expert

Connoisseur: Knowledgeable judge
Expert: Skilled person

117. Conundrum, Puzzle

Conundrum: Difficult problem
Puzzle: Something hard to solve

118. Copious, Abundant

Copious: Plentiful in amount
Abundant: More than enough

119. Corroborate, Confirm

Corroborate: Support with evidence
Confirm: Establish truth

120. Cryptic, Enigmatic

Cryptic: Having hidden meaning
Enigmatic: Mysterious