There are several synonyms for the phrase "compare indicator". One such synonym is "matching measure". This term refers to any metric or method that is used to compare two or more items to determine how similar or dissimilar they may be. Another synonym for "compare indicator" is "correlation coefficient". This phrase refers specifically to a statistical measure of the strength and direction of a relationship between two variables. Other synonyms for this phrase may include "similarity score", "analogous gauge", "parallel assessment", or "equivalence marker". No matter what phrase is used, the idea remains the same: to accurately measure and compare the similarities and differences between two or more entities.