  We use Monte Carlo simulations and assumptions from evolutionary game theory
in order to study the evolution of words and the population dynamics of a
system comprising two interacting species which initially speak two different
languages. The species are characterized by their identity, vocabulary and have
different initial fitness, i.e. reproduction capability. The questions we want
to answer are: a. Will the different initial fitness lead to a permanent
advantage? b. Will this advantage affect the vocabulary of the species or the
population dynamics? c. How will the spatial distributions of the species be
affected? Does the system exhibit pattern formation or segregation? We show
that an initial fitness advantage, although is very quickly balanced, leads to
better spatial arrangement and enhances survival probabilities of the species.
In most cases the system will arrive at a final state where both languages
coexist. However, in cases where one species greatly outnumbers the other in
population and fitness, then only one species survives with its final language
having a slightly richer vocabulary than its initial language. Thus, our
results offer an explanation for the existence and origin of synonyms in all
currently spoken languages.
