Polluted.
polluted
pupil
Plain.
A "teacher" is one who imparts information or knowledge to othersThe word cannot have a direct antonym (someone who takes away your knowledge). However, the complement to "teacher" is "student." The word meaning student that begins with a P is pupil.
Plain
some human names from starting letter p
Procrastinate.
Some 10 letter P words:partialityparticularpermissionpersonallyprecautionpresupposepronouncedproportionprejudicedproportionprefermentprepaymentpreachmentplacementspracticingpercentileproductivepermissiveprovisionsprotectionprovention
Python is a snake. It begins with the letter P.
I can find none that start with the letter P.
poet
There are no 23 letter words in the English language starting with the letter p.