一首
a [one] (tanka) poem一首詠むcompose [write] a tanka poem
歌
1〔歌謡〕a song歌を歌うsing (a song)歌を習うtake lessons in singing/take vocal lessons歌が上手[下手]だbe good [poor]...
歌詠み
〔短歌を詠むこと〕composing tanka;〔歌人〕a tanka poet
歌境
〔歌を詠むときの心境〕the poet's mood when writing a poem
詠む
和歌を詠むcompose [write] a 「Japanese poem [waka]