We don't have synonyms for petropolis yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are metropolis, necropolis and propolis.
(n) :
A city and municipality of Rio de Janeiro, Brazil, and historic state capital.
(n) :
Nickname for Fort McMurray: an urban service area (equivalent to a city) in northeastern Alberta, Canada; the center of the Alberta oil industry.
(n) :
A neighbourhood of Porto Alegre, Rio Grande do Sul, Brazil.
(n) :
A city and municipality of Rio de Janeiro, Brazil, and historic state capital.
(n) :
Nickname for Fort McMurray: an urban service area (equivalent to a city) in northeastern Alberta, Canada; the center of the Alberta oil industry.
(n) :
A neighbourhood of Porto Alegre, Rio Grande do Sul, Brazil.