WordNet (r) 3.0 (2006):

fellow feeling
    n 1: sharing the feelings of others (especially feelings of
         sorrow or anguish) [syn: sympathy, fellow feeling]

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "fellow feeling":
   accord, accordance, affectionateness, affinity, agape, agreement,
   amity, an in, benignancy, benignity, bipartisanship,
   bonds of harmony, brotherhood, brotherly love, caring, caritas,
   cement of friendship, charity, chord, coaction, coadjuvancy,
   coadministration, coagency, cochairmanship, codirectorship,
   collaboration, collaborativeness, collectivism, collusion,
   commensalism, common effort, common enterprise, communalism,
   communion, communism, communitarianism, community,
   community of interests, compassion, compatibility, complicity,
   concern, concert, concord, concordance, concurrence, congeniality,
   cooperation, cooperativeness, correspondence, duet, duumvirate,
   echo, ecumenicalism, ecumenicism, ecumenism, empathy, esprit,
   esprit de corps, favor, favorable regard, feeling of identity,
   feeling of kinship, fellowship, fraternal feeling,
   frictionlessness, friendly relations, good graces, good terms,
   good understanding, good vibes, good vibrations, goodness,
   goodness of heart, goodwill, graciousness, happy family, harmony,
   heart of gold, humaneness, humanity, identification, identity,
   involvement, joining of forces, joint effort, joint operation,
   kindheartedness, kindliness, kindly disposition, kindness, kinship,
   like-mindedness, love, loving kindness, mass action, morale,
   mutual assistance, mutual regard, mutualism, mutuality, niceness,
   octet, oneness, pathos, peace, pooling, pooling of resources,
   pulling together, quartet, quintet, rapport, rapprochement,
   reciprocity, regard, relating, respect, response, responsiveness,
   septet, sextet, sharing, softheartedness, solidarity,
   soul of kindness, symbiosis, sympathetic chord,
   sympathetic response, sympathy, symphony, synergism, synergy,
   team spirit, teamwork, tenderheartedness, trio, triumvirate,
   troika, understanding, union, unison, united action, unity, vibes,
   vibrations, warmheartedness, warmth, warmth of heart