highlighting prefixed keywords

I need to apply custom highligthing in a setup that should be simple
for people who understand highligthing:

I have a bunch of keywords with a common prefix, the single character
'c'. The keywords are to be listed one by one, not obtained via some
algorithm. Example:

cmount
cumount
copen
cclose
(etc)

So, I want to highlight these keywords, *minus the prefix*, with some
colour (say, the same colour for all keywords). That is, in "cmount",
only "mount" should be coloured, not the leading 'c'.

TIA

Jorge Almeida

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