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ag-, ig-, act- (Latin: do, act, set in motion, drive, lead, conduct, guide).


act:
activate:
activation:
actor:
actress:
actuate:
agenda:
agent:
agile:
agitate:
ambiguous:
castigate:
coact:
coagulate:
cogitate:
congent:
corrigible:
enact:
enactment:
exact:
exactness:
exigency:
exiguous:
fumigate:
fumigation:
hyperactive:
ignite:
immigrate:
inact:
inaction:
inactive:
interact:
interaction:
intransigence:
intransigent:
litigate:
litigation:
mitigate:
mitigation:
navigate:
navigation:
proactive:
radioactive:
react:
reaction:
reactivate:
retroactive:
transact:
transaction:


Etc. is a perfect word-when you can't think of the right one.

E.C. McKenzie