calculate — If you calculate a number or amount, you discover it from information that you already have, by using arithmetic, mathematics, or a special machine.
speculate — to engage in thought or reflection; meditate (often followed by on, upon, or a clause).
Four-or-more syllable rhymes
articulate — If you describe someone as articulate, you mean that they are able to express their thoughts and ideas easily and well.
decapitate — If someone is decapitated, their head is cut off.
immaculate — free from spot or stain; spotlessly clean: immaculate linen.
infatuate — to inspire or possess with a foolish or unreasoning passion, as of love.
procrastinate — to defer action; delay: to procrastinate until an opportunity is lost.
