parasite (n.)
- adherent
- algae
- appendage
- attendance
- attendant
- autophyte
- barnacle
- bean
- beat
- bedbug
- beggar
- bloodsucker
- bracken
- buff
- bummer
- cadger
- chigoe
- climber
- cockroach
- cohort
- conferva
- cortege
- court
- courtier
- crab
- creeper
- deadbeat
- dependent
- diatom
- disciple
- drone
- entourage
- fan
- fern
- flea
- flunky
- follower
- following
- freeloader
- fucus
- fungus
- grapevine
- grayback
- gulfweed
- hanger-on
- henchman
- herb
- hyena
- idler
- ivy
- jackal
- jigger
- kelp
- laze
- leech
- legume
- lentil
- liana
- lichen
- liverwort
- louse
- mendicant
- mite
- mold
- moocher
- mosquito
- moss
- mushroom
- nit
- nonworker
- panhandler
- partisan
- pea
- phytoplankton
- public
- puffball
- pulse
- pursuer
- retinue
- roach
- rockweed
- rout
- rust
- saprophyte
- sargasso
- sargassum
- satellite
- scrounger
- seaweed
- sectary
- shadow
- smut
- spiv
- sponge
- sponger
- stooge
- successor
- succulent
- sucker
- suite
- supporter
- tail
- tick
- toadstool
- train
- trainbearer
- vermin
- vetch
- vine
- votary
- weevil
- wort
- wrack
