Mammon
is,
Riches; wealth;
or the god of riches.

Webster's 1828
American Dictionary
of the
English Language

Mammonist
A mammonist is a person
devoted to the acquisition of wealth; one whose affections
are placed supremely on
riches; a worldling.
   Webster's     
  1828      
No man can serve two masters:
for either he will hate the one,
and love the other;
or else he will hold to the one,
and despise the other.
Ye cannot serve God
and mammon.

Matthew 6:24