aid
alternative
ancient
animal
annelid
annelida
anxiety
blood
bloodsucking
care
closed
dangerous
detoxification
disease
disgust
doctor
earthworms
education
glass
healing
health
heparin
hermaphrodite
hirudinea
hirudotherapy
hospital
invertebrate
jar
leech
leeching
medical
medicalleech
medicinal
medicine
microbiology
nature
parasite
pot
relief
science
skin
specimen
stained
sucker
sucking
therapy
water
wet
worm
zoology