Alphabet silly.
aesthete
No eight-letter words could be found in the TWL, (the Scrabble dictionary). However, these seven-letter words could be made:arenoushoarsensenhoraunhorse
Envelope.
Graduate.
Double-u
Inimical comes to mind, but I'm sure there are others. I can do you one letter better: a 7 letter word that contains three Is is "idiotic".
Stretch is a 7 letter word with e as the only vowel. Twelfth is another 7 letter words containing only one vowel.
some words include:pabulumspachadompachalicpachinkopachisispachoulipachucospacifiedpacifierpacifiespacifismpacifistpackablea full list of words beginning with P containing 8 letters can be found here (see related links), although this list doesn't include every 8 letter word containing the letter P.
The only word that matches is "BELIQUOR"
envelopeAn envelope usually contains only one letter.
"EMIGRATE"
"UPWAFTED"