According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 59 words with the pattern PA----A-. That is, eight letter words with 1st letter P and 2nd letter A and 7th letter A. In alphabetical order, they are:
padellas
padishah
paenulae
paenulas
pagurian
paisanas
palabras
palatial
palinkas
palmyras
palookas
panacean
panaceas
pancreas
pandoras
panduras
panhuman
panislam
panochas
papillae
papillar
pappadam
papricas
paprikas
papyrian
paragram
parallax
paraquat
parashah
parathas
paraxial
parazoan
parbreak
pareiras
parellas
parental
parfocal
parganas
parietal
parishad
parmesan
partisan
partitas
partizan
passatas
pastinas
pastoral
pastural
patagial
patellae
patellar
patellas
paternal
patronal
pattamar
pattypan
pavlovas
pavonian
paxiubas
Primper.
pitcher
prepare
Teashop treetop trollop .
pablum
Some 10 letter P words:partialityparticularpermissionpersonallyprecautionpresupposepronouncedproportionprejudicedproportionprefermentprepaymentpreachmentplacementspracticingpercentileproductivepermissiveprovisionsprotectionprovention
preposterous
procrastinate
pi
phenomenal
pepperoni
There are no 23 letter words in the English language starting with the letter p.