aid
alternative
ancient
animal
annelid
biology
black
bleeding
blood
body
care
closed
complementary
dangerous
detoxification
disgust
doctor
glass
healing
health
hemorrhage
hermaphrodite
hirudinization
hirudotherapy
hospital
invertebrate
jar
leech
leeching
lymph
lytic
medical
medicinal
medicine
nature
paraphyletic
parasite
physic
procedure
research
science
skin
small
spa
sucker
therapy
varicose
water
wet
worm