red turnip (any of several varieties of turnip (Brassica rapa) that are red or purple in color) / radish / beet, beetroot

(astronomy) right ascension

Kyūjitai form of 赤経 (“right ascension”)

(astronomy) declination

(literally) red beard; a man with a red beard / a Ryukyu robin, Larvivora komadori

a red paper lantern, typically used as a sign marking an izakaya, an inexpensive Japanese pub / (figuratively) an izakaya

(mahjong) red tile; unique to Japanese mahjong and used to score bonus points

a red papier-mâché bobblehead cow toy, a kind of regional omiyage regarded as symbolic of the Aizu region of Japan

red lead

(idiomatic) a complete stranger