assume(assume a great deal of personal responsibility)——assumption
consume——consumer
——consumption
presume——presumably
resume
-fer-
offer (offer sb. sth=offer sth to sb)
suffer(suffer from)——suffering
prefer(prefer A to B )——preferable(It is preferable for sb.to do sth)
——preference
differ——different
——difference
——differentiate(A differ from B; differentiate A from B)
——indifferent
——indifference
refer(refer to ...as..)——referene
confer——conference
defer(We will defer to whatever the committee decides.)——deference
infer——inference
interfere——interference
transfer——transferable