noun
Ogura Hyakunin Isshu; the Ogura anthology
Refers specifically to the classic poetry anthology compiled by Fujiwara no Teika, often called 小倉百人一首. This is a proper noun for the work itself.
See also: 百人一首
百人首は藤原定家が選んだ和歌集です。
Hyakunin Isshu is a collection of waka poems selected by Fujiwara no Teika.
noun
hyakunin isshu karuta; the card game based on the anthology
Refers to the competitive card game using the poems from the Ogura Hyakunin Isshu. Often simply called かるた in context.
See also: 百人一首
正月に家族で百人首をして遊んだ。
We played hyakunin isshu karuta as a family during the New Year holidays.
Variant of 百人一首 (hyakunin isshu), using the reading 首 (しゅ) for 首 instead of いっしゅ. The exact origin of this variant is uncertain.