good Samaritan

from WordNet (r) 3.0 (2006)

good Samaritan
    n 1: a person who voluntarily offers help or sympathy in times
         of trouble

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "good Samaritan":
      Samaritan, aid, aider, assister, backer, befriender, benefactor,
      benefactress, benefiter, good person, help, helper, helping hand,
      jack-at-a-pinch, ministering angel, ministrant, patron, succorer