Sometimes, words in songs rhyme, but not always! Look at your favourite song:
does every line rhyme? Mark them! If you choose to have rhyming words in your song, you can use a rhyme words dictionary like https://www.rhymezone.com/
When writing a lyric you have to choose your words very carefully. Try to find words that sound similar, those words usually sound very good together in a line (for example... will and still both have the "i" sound). Can you find similar sounding words in your favourite song? Mark them!
Look at the next slides for an example of the exercise. (Marked green = rhyming words, marked blue = similar sounding words)