Drastic.
rebirth
Cordialcountrycommandcommendconveneconfineconvertconvictcollidecorrodecompetecomputecompilecomparecollectcorrect
A seven letter word beginning with C with a the fourth letter C is cracker.
Seven up Segramssoda
because
rebirth
nascent
diurnal
hearten :-)
classic
A 6-letter word beginning with 'a' that means smart is astute.
toponym
ignoredillicitimpaledimpoundimpressimmoralinheritinclineindentsingrateinsultsingestsingrowninvalidinsistsinjectsinvents
creamer
unusual
ossicle
neutron