[1] : The Collaborative International Dictionary of English v.0.48

harm \harm\ haumrm, n. oe. harm, hearm, as. hearm; akin to
   os. harm, g. harm grief, icel. harmr, dan. harme, sw. harm;
   cf. oslav.  russ. sram' shame, skr. ,crama toil, fatigue.
   1. injury; hurt; damage; detriment; misfortune.
      1913 webster

   2. that which causes injury, damage, or loss.
      1913 webster

            we, ignorant of ourselves,
            beg often our own harms.              --shak.

   syn: mischief; evil; loss; injury. see mischief.
        1913 webster
see also:
mischief 

[2] : The Collaborative International Dictionary of English v.0.48

harm \harm\, v. t. imp.  p. p. harmed haumrmd; p. pr. 
   vb. n. harming. oe. harmen, as. hearmian. see harm, n.
   to hurt; to injure; to damage; to wrong.
   1913 webster

         though yet he never harmed me.           --shak.
   1913 webster

         no ground of enmity between us known
         why he should mean me ill or seek to harm. --milton.
   1913 webster
see also:
harmed harming harm 

[3] : WordNet (r) 2.0

harm
     n 1: any physical damage to the body caused by violence or
          accident or fracture etc. syn: injury, hurt, trauma
     2: the occurrence of a change for the worse syn: damage, impairment
     3: the act of damaging something or someone syn: damage, hurt,
         scathe
     v : cause or do harm to; "these pills won't harm your system"
see also:
injury hurt trauma damage impairment scathe 

[4] : Moby Thesaurus II by Grady Ward, 1.0

166 moby thesaurus words for "harm":
   abomination, abuse, afflict, affliction, aggravate, aggrieve,
   atrocity, bad, badness, bane, banefulness, bankruptcy, befoul,
   befoulment, bewitch, blemish, blight, bother, breakage, breakdown,
   bugbear, burden, calamity, collapse, condemn, corrupt, corruption,
   crack-up, crippling, crucify, crushing burden, crying evil, curse,
   damage, death, defile, defilement, deleteriousness, deprave,
   despoil, despoliation, destroy, destruction, deteriorate,
   detriment, dilapidate, dilapidation, disablement, disaccommodate,
   disadvantage, discommode, disease, disoblige, disrepair, disserve,
   distress, do a mischief, do evil, do ill, do violence to, do wrong,
   do wrong by, doom, drawback, embitter, encroachment, endamage,
   envenom, evil, exacerbate, get into trouble, grievance, handicap,
   harass, havoc, hex, hobbling, hurt, hurting, ill, impair,
   impairment, impose upon, incapacitation, incommode, inconvenience,
   infect, infection, infliction, infringement, iniquity, injure,
   injury, inroad, irritate, jinx, liability, loss, loss of ground,
   maiming, make worse, maltreat, mar, mayhem, menace, mischance,
   mischief, misfortune, mistreat, misuse, molest, mutilation,
   nemesis, noxiousness, open wound, outrage, perniciousness,
   persecute, pest, pestilence, plague, play havoc with,
   play hob with, poison, pollute, pollution, prejudice, put back,
   put out, put to inconvenience, put to trouble, ruination,
   ruinousness, rum, running sore, sabotage, savage, scathe, scourge,
   sickening, spoil, spoiling, step backward, taint, tarnish,
   the worst, thorn, threaten, torment, torture, toxin, trouble,
   venom, vexation, violate, visitation, vitiate, weaken, weakening,
   wickedness, woe, worsen, wound, wreak havoc on, wrong,
   wrongdoing

Harm >> H Words
Harm, definition of term: Harm
harm_pag1.html

Cause Harm >> C Words
Cause Harm, definition of term: Cause Harm
cause+harm_pag1.html