py

noun2

1. •
   Initialism of pinyin.
2. •
   Initialism of pack-year.

preposition1

1. •
   Pronunciation spelling of by.

noun3

1. •
   Abbreviation of Puducherry: a union territory of India.
2. •
   Initialism of person-year.
3. •
   Initialism of pack-year.