anti-
against
antibody
bi-
two
bilateral
circum-
around
circumnavigate
com- or con-
with, together
conform
contra- or counter-
against
contradict
de-
away from
detour
deca-
ten
decade
extra-
outside, beyond
extracurricular, extraordinary
fore-
in front of
foretell
geo-
earth
geology
hyper-
above, over
hyperactive
il-
not
illogical
mal- or male-
evil, bad
malediction
multi-
many
multiply
ob-
blocking
obscure
omni-
all
omnibus
out-
external
outside
que-, quer-, or ques-
ask
question, query
re-
back, again
return
semi-
half
semisweet
super-
over, more
superior
tele-
far
telephone
trans-
across
transatlantic
un-
not
uninformed
Suffixes are busy little word segments. They affect the meaning of a word and usually tell you what part of speech a word is (which comes in handy when you’re navigating through Word Knowledge questions that you can’t answer immediately).