Using all the letters you get: languet
There's no seven letter word, here are the possible six letter words:atonernatronnonartornatetannertonner
A seven letter word from the letters in 'appliance' is pelican.
6-letter word: sneeze7-letter word: sneezed
detract
Pendant.
Dandles
That's vicious.
gambols
amusing
dogears
'VALANCE'
clothes