comparing -
the act of examining resemblances; "they made a comparison of noise levels"; "the fractions selected for comparison must require pupils to consider both numerator and denominator"
analogy drawing a comparison in order to show a similarity in some respect; "the operation of a computer presents and interesting analogy to the working of the brain"; "the models show by analogy how matter is built up"
collation careful examination and comparison to note points of disagreement
confrontation a focussed comparison; bringing together for a careful comparison