In songs, they often just rhyme the last word, so you could try something like "he's a liar" -- 3 syllables, with the last one rhyming. (In the song "Light My Fire" by the Doors, that is what they do-- they rhyme fire with liar, and higher and even pyre.)
The word "flame" rhymes with "claim" and also means fire.
Polluted? I don't know, im not that good with rhymes
fire
The word "expire" rhymes with fire and means to come to an end or die.
alpaka
sire
yorkshire
"you can be the witness"
Tire and filedtire
Flame
flame
.....Fetching Tire?