Run for Manage, or Conduct. Vulgar—hardly better than slang.
Say for Voice. "He had no say in determining the matter." Vulgar.
Scholar for Student, or Pupil. A scholar is a person who is learned, not a person who is learning.
Score for Win, Obtain, etc. "He scored an advantage over his opponent." To score is not to win a point, but to record it.
Second-handed for Second-hand. There is no such word.
Secure for Procure. "He secured a position as book-keeper." "The dwarf secured a stick and guarded the jewels that he had found." Then it was the jewels that were secured.
Seldom ever. A most absurd locution.
Self-confessed. "A self-confessed assassin." Self is superfluous: one's sins cannot be confessed by another.
Sensation for Emotion. "The play caused a great sensation." "A sensational newspaper." A sensation is a physical feeling; an emotion, a mental. Doubtless the one usually accompanies the other, but the good writer will name the one that he has in mind, not the other. There are few errors more common than the one here noted.
Sense for Smell. "She sensed the fragrance of roses." Society English.