Startle rhymes with:
bartel, bartl, bartle, bartol, hartel, hartell, hartl, hartle, bartel, bartl, bartle, bartol, bortle, chortle, haertel, hartel, hartell, hartl, hartle, immortal, mortal, oertel, portal, shortall
Startle sounds like:
stardel, stordahl, straddle, stradley, sturdhal