Answer: parasite

AnswerCrossword Clue
PARASITE

Host's annoyance

PARASITE

Opposite of a host

PARASITE

Leech

PARASITE
Moocher
PARASITE
Mooch
PARASITEOne who takes something and gives nothing
PARASITEHanger-on
PARASITEUser
PARASITEFlea, to a dog
PARASITEHost's counterpart in a symbiotic relationship
PARASITESycophant.
PARASITEFlea.
PARASITEMistletoe is one.
PARASITEHanger-on.
PARASITEThe mistletoe, for instance.
PARASITEOrchid, for example.
PARASITELeech.
PARASITESponger
PARASITEFreeloader
PARASITEToady
PARASITESycophant
PARASITEAphid or flea
PARASITEWhat a host holds
PARASITETick or flea, e.g.
PARASITEDog flea, e.g.
PARASITELeech or tapeworm, e.g.
PARASITEHost's counterpart