ninguém

• Pron

  no one; nobody (not one person)

• Noun

faz

1. inflection of fazer:
2. inflection of fazer:

nada

• Pron

  nothing (not any thing; no thing)

• Adv
• Noun
• Verb
• Adj

por nada

1. Used other than figuratively or idiomatically: see por, nada.
2. not at all; you're welcome

por

• Prep

  1. for (on behalf of)
  2. for (in order to obtain)
  3. for (over a period of time)
  4. for (indicates something given in an exchange)
  5. by (through the action or presence of)
  6. by (indicates the creator of a work)
  7. by (using the rules or logic of)
  8. times, by, multiplied by
  9. by; in the name of (indicates an oath)
  10. per; a; each (expresses the ratio of units)
  11. by (indicates a mathematical division)
  12. through (entering and then leaving; being the medium of)
  13. around; about; near (in the vicinity of)
  14. around; about; approximately (close in quantity, amount or value to)
  15. throughout (in various parts of)
  16. for; in favour of (supporting)
  17. for its own sake; without a motive
  18. about to

• Verb