Ardor
Part of speech: noun
Definition: great warmth of feeling; fervor; passion spirit
Example sentence: In their efforts to discredit human freedom, the Putinites denounce the sins that may occur under the reign of liberty with the same ardor, the same sincerity, and the same purpose that animated their Soviet forebears.
Ardour
Part of speech: noun
Definition: Great warmth of feeling; fervor; passion.