noun
collection of waka poems; poetry anthology
Primarily refers to a compiled collection of waka (classical Japanese poetry), such as the imperial anthologies. Also used more broadly for any anthology of poems.
See also: 和歌
古今和歌集は最初の勅撰歌集です。
The Kokin Wakashū is the first imperial anthology of waka.
彼女は自分の短歌をまとめて歌集
She compiled her tanka and published a poetry collection.
noun
songbook; collection of songs
Can refer to a book of songs or lyrics, though 歌集 is less common for modern popular music; 曲集 or ソングブック may be used instead.
この歌集には昭和の名曲がたくさん載っている。
This songbook contains many famous Showa-era songs.