Here's what rhymes with rationalise.

Consider these alternatives

rationalize / size modernise / peace systematize / size optimise / price standardize / size optimize / size globalize / size professionalize / size minimise / price revitalise / devitalise rectify / high localize / size mechanize / size concretize / size simplify / high internationalize / size distort / called reorganize / size monetize / size decentralize / size sanitize / size rationalisation / relation rebalance / balance harmonise / peace attune / soon centralize / size maximise / price rationalising / leaving