Planecon rhymes with:
catchacan, comecon, emoticon, farrakhan, alarcon, catchacan, comecon, digicon, econ, emoticon, ethicon, farrakhan, helicon, lexicon, logicon, midcon, nikon, oerlikon, polysilicon, semicon, technicon, walk-on, yukon
Planecon sounds like:
palmisano, pleonasm, polynesian, pulmazyme, pulmozyme