詩歌

Noun

 * 1)  poetry; poem
 * 2)  hymn
 * 1)  hymn

Etymology 1
→

Shift from older shika below.

Now the form, possibly to avoid confusion with homophones.

Noun

 * 1) Japanese and Chinese poetry
 * 2)  a rhymed poem

Etymology 2
From.

Noun

 * 1)  Japanese and Chinese poetry
 * 2)  a rhymed poem