1. It is easier to write lyrics than poems because most of them are not as profound as poems, and people know the meaning of lyrics.
2. It is more difficult to write lyrics than poems, because the words in each sentence of lyrics should be equal or close. As far as modern poetry is concerned, words, sentences and paragraphs are more casual.
3. In fact, sometimes a good lyric is a good poem or a poem; Sometimes a good poem is also a good lyric poem.