1) Comparison maker 2) Debater who uses comparisons 3) Explainer, of a sort 4) Ratiocinator 5) Reasoner 
• (n.) One who reasons from analogy, or represent, by analogy.
(from the article `linguistics`) ...or as arrived at arbitrarily by a social convention. This dispute regarding the origin of language and meanings paved the way for the development ...
A·nal'o·gist noun One who reasons from analogy, or represent, by analogy. Cheyne. 
[n] - someone who looks for analogies or who reasons by analogy
noun someone who looks for analogies or who reasons by analogy
a person who employs or argues from analogy. · a person who seeks analogies.