Primper.
pitcher
prepare
Teashop treetop trollop .
pablum
Some 10 letter P words:partialityparticularpermissionpersonallyprecautionpresupposepronouncedproportionprejudicedproportionprefermentprepaymentpreachmentplacementspracticingpercentileproductivepermissiveprovisionsprotectionprovention
preposterous
procrastinate
pepperoni
pi
phenomenal
There are no 23 letter words in the English language starting with the letter p.