Here is a list of nouns that start with AR.
arabesque, arak, arbiter, arbitration, arc
arcade, arch, archaeology, archaism, archbishop
archdiocese, archenemy, archery, archfool, archipelago
architect, architecture, archtype, ardor, area
arena, areosol, argon, argot, argument
argumentation, aridity, aristocracy, arithmetic, arm
armadillo, armament, armchair, armful, armhole
armistice, armload, armoire, armor, armpit
army, arnica, aroma, arousal, arrack
arrangement, array, arrest, arrival, arrogance
arrow, arroyo, arsenal, arsenic, arside
arson, art, artery, article, articulation
artifice, artificer, artificiality, artillerist, artillery
artisan, artist, artistry, aryl, arylesterase
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