Barbarian
There is no seven letter word that can be made from those letters. Words that can be made from the letters 'adtnpob' are:aadoadoptanandaptatatopbanbandbatbatonboaboatbonddabdodondotnabnapnonodnotoatonoptpapadpanpantpatpodpondpottabtadtantaptotoadtontop
Seven letter words that can be made from those letters are:amnesiapumpkin
There are 12 two letter arrangements of the letters in PARK.
'PROSCENIUM' itself is the only 10-letter word using those letters. There are several 8-letter words, but no other 10-letter ones.
The longest word that can be made using these letters is hydrolytic.
laxity
Grandma
benesbinesjibesseine
Five letter words that can be made from those letters are vodka and goads.
Eight letter word using the letters, naloeyianrgt: yearning. gyration. learning.
Seven letter words that can be made from those letters are shutter and stretch.
There is no seven letter English word that can be made from those letters. Words that can be made from the letters 'fcgraen' are:aaceacneacreageanangerarcarecafecagecancanecarcarecraneearearnerafacefanfangfarfarcefarefearfenfernfrancgeargracenacrenagnearraceragrageranrangrange