Some songwriting tools

Lyrics are challenging.  Some amount of rhyming is nice. 

B-rhymes 

B-Rhymes is a rhyming dictionary that's not stuck up about what does and doesn't rhyme. It gives you words that sound good together even if don't technically rhyme.

 and 

Rhymezone

Rhyme zone is powerful but maybe a bit tricky to get the right thing back.

“Slant” rhymes work well in lyrics.  It’s all about the last stressed vowel, less so the consonants.   Perfect rhymes are great when you can find one that makes sense semantically but too many might end up sounding a bit too cute.