smooth
suites-that;s odd, six letter word, 7 letters tissue (or even tissues with the 7 letters)
There are no English words that meet the criteria, even when you repeat the letters (which you need to do to make five letters spell a six-letter word).
A six letter work is sicker.
6-letter word: sneeze7-letter word: sneezed
hernia
You can make CLERIC
Cello is a five letter word that sounds like six letters when pronounced. The letter c is pronounced ch to make the word sound like six letters.
careen
Tawdry
dynamo
acting
There's no seven letter word, here are the possible six letter words:atonernatronnonartornatetannertonner