One who is filled with enthusiasm; one who is ardently absorbed in an interest or pursuit: a baseball enthusiast. (noun)
A zealot; a fanatic.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "enthusiast" in a sentence
"Model train enthusiast David K. Smith has built a miniscule train layout which works – the train travels in an ellipse, including through a “mountain.”"
"The latest enthusiast is the German insurance company Munich Re."
"Much efforts and money were invested in this colorful and technologically advanced production at the Adelphi Theatre in London's West End. Yet, even an amateur musical enthusiast is hard-pressed to understand what justified the show."