There's no 7-letter word, here are three 6-letter words that can be made:
Lapels
The longest word that can be made using these letters is hydrolytic.
There is no seven letter word that can be made from those letters. Words that can be made from the letters 'adtnpob' are:aadoadoptanandaptatatopbanbandbatbatonboaboatbonddabdodondotnabnapnonodnotoatonoptpapadpanpantpatpodpondpottabtadtantaptotoadtontop
"Anted" is a five-letter word.
Eight letter word using the letters, naloeyianrgt: yearning. gyration. learning.
There is no 9 letter word, 4th letter r that can be made from those letters.
Seven letter words that can be made from those letters are:amnesiapumpkin
Seven letter words that can be made from those letters are shutter and stretch.
Five letter words that can be made from those letters are vodka and goads.
The word jackals can be made from those letters.
'PROSCENIUM' itself is the only 10-letter word using those letters. There are several 8-letter words, but no other 10-letter ones.
There is no 8-letter word that can be made, there are these 7 and 6-letter words though:senegasagenesagonesgenoasgnosesgossanseasonsegnossenega
The six letter word that can be made with those seven letters are:charmsstarch