zealot
Definition of zealot:
part of speech: noun
One who engages warmly and earnestly in any cause; one carried away by excess of zeal.
Usage examples:
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" And when I catch sight of his lordship," added the amiable zealot I'll astonish him.
William Magnay in "A Poached Peerage". -
When the Prophet got down on his knees, Starr was silent; it looked as if this zealot intended to offer prayer- and the bank examiner did not care to earn the reputation of being a disturber of a religious gathering.
Holman Day in "When Egypt Went Broke". -
Tall High- priest, with zealot fires Blazing in those eyeballs old, Swathes him, as his rank requires, Head to foot, in linen fold.
Richard Doddridge Blackmore in "Fringilla: Some Tales In Verse".