Credible means capable of being believed; believable.
Creditable means bringing or deserving credit, honor, reputation, or esteem.
6. Credulity & Credulous
Credulity is a tendency to believe too readily.
Usage Example: The manager questioned the credulity of the new officer who believed anything his juniors said.
Credulous is inclined to believe almost anything; gullible; naive.
Usage Example: Young children are generally credulous and fall readily into the traps of marketers.
7. Crevasse & Crevice
Crevasse is a fissure, or deep cleft, in glacial ice, the earth's surface, etc.
Usage Example: While hiking two members of the team fell into a crevasse.
Crevice is a crack forming an opening; cleft; rift; fissure.
Usage Example: The old mansion had a lot of crevices in the walls.
8. Critic & Critique
Critic means a person who judges, evaluates, or criticizes.
Usage Example: The art critic was very efficient and very much in demand.
Critique is an article or essay criticizing a literary or other work; detailed evaluation; review.
Usage Example: Book reviewers generally go deep into the text to critique it.
9. Collaborate & Corroborate
Collaborate means to work one with another; cooperate, as on a literary work.
Usage Example: Some French noblemen collaborated with The Nazis when they occupied Paris.
Corroborate means to make more certain; confirm.
Usage Example: There was nothing in his story to corroborate with the actual happening.
10. Connote & Denote
Connote means to signify or suggest (certain meanings, ideas, etc.) in addition to the explicit or primary meaning.
Usage Example: Words such as error connote a negative attitude in humans.
Denote means to be a mark or sign of; indicate.
Usage Example: Her face denoted her feelings very clearly.