adherent
algae
appendage
attendance
attendant
autophyte
barnacle
bean
beat
bedbug
beggar
bloodsucker
body of retainers
bracken
brown algae
buff
bummer
cadger
cat flea
cavaliere servente
chigoe
climber
cockroach
cohort
conferva
confervoid
cortege
coupon clippers
court
courtier
crab
creeper
dangler
deadbeat
dependent
diatom
disciple
dog flea
drone
entourage
fan
fern
flea
flunky
follower
following
freeloader
fruits and vegetables
fucus
fungus
parasite drag
parasitical
parasiticide
parasitism
parasitology
bacteria
bug
germ
infection
insect
knave
microbe
microorganisms
mite
mosquito
pest
predator
rodent
spider
thief
tyrant
vermin
villain
virus
worm
commensal