submarket
noun
sub·mar·ket ˈsəb-ˌmär-kət 
variants or sub-market
plural submarkets or sub-markets
: a portion or subdivision of a market
a profitable submarket of the banking industry
… is one of several local travel agencies, and several dozen around the country, that belong to a little known sub-market that sells tickets on international flights for … up to 70 percent off the normal cost of a one-way ticket.
Bernie Kohn
Bernie Kohn
Word History
First Known Use
1880, in the meaning defined above