C1 Complete Advanced U2 - Word Formation

(in-)numerous, numerology, numeral, (un-)numbered, (in-)numerable, numeracy

communal, communicate, communicative, communication, community (-ies), communism, intercom

assumption, assumptive, assumed, unassuming, unassumed

historical(-ly), historian, historic, prehistory, prehistoric

ethnography, ethincal, ethnically, ethnology, ethnicism

(un-)influenntial(-ly), (un-)influenced, influent

Action, actor, actress, inactivity, activity(-ies), (in-)active

different, differencial, indifferent, difference(s), indifference, differentiate

measurement, measurable, unmeasurable, immeasurable, immense (due to Latin root "mensura" and "mensus"), immensly, immenseness