An instruction or command that compares two values or states.
Comparison.
To form the three degrees of comparison of (an adjective).
To be similar (often used in the negative).
To assess the similarities and differences between two or more things ["to compare X with Y"]. Having made the comparison of X with Y, one might have found it similar to Y or different from Y.
To declare two things to be similar in some respect ["to compare X to Y"].