find Synonym

A function designed to deal with synonyms issue

The function goal is to find a representative word (keyword) from a used specified dictionary (synonymsList), retuning an appropriate keyword when one of its synonyms is typed as input.
This allows the a programmer to be more flexible when dealing inputs, using multiple string meaning the same input. Consider a case where each of the inputs :{'Mother', 'female parent', 'matriarch', 'mom', 'mommy', 'ma', 'mama'} will result the same output 'Mother', thus allowing multiple ways to treat 'Mother'.