amoeba
bacillus
bacteria
bacterial
bacterium
biology
cartoon
character
craftsman
cute
design
drain pipe
emoticon
emotion
expression
funny
germ
germs
gonococcus
gonorhoeae
gonorrhea
gonorrhoea
hands
handyman
happy
illustration
infective
legs
mascot
mechanic
microbe
molecule
morphology
neisseria
neisseria gonorhoeae
organism
plumber
plumbing
proficient
science
small
smile
style
system
test
tools
virus
work
workman