Reactionary
Part of speech: adjective
Definition: Opposed to change; urging a return to a previous state. Very conservative.
Part of speech: noun
Definition: One who is opposed to change. One who is very conservative.
Example sentence: True conservatives fear anything that is at odds with the status quo, even to the extent of being unable to recognise when the status quo represents injustice. And reactionary conservatives actually want to tear down the gains of the past.
Far-right
Part of speech: adjective
Definition: Very conservative