fusion — the act or process of fusing; the state of being fused.
Three-syllable rhymes
allusion — An allusion is an indirect reference to someone or something.
collusion — Collusion is secret or illegal co-operation, especially between countries or organizations.
conclusion — When you come to a conclusion, you decide that something is true after you have thought about it carefully and have considered all the relevant facts.
confusion — If there is confusion about something, it is not clear what the true situation is, especially because people believe different things.
intrusion — Law. an illegal act of entering, seizing, or taking possession of another's property. a wrongful entry after the determination of a particular estate, made before the remainderman or reversioner has entered.
occlusion — the act or state of occluding or the state of being occluded.
preclusion — to prevent the presence, existence, or occurrence of; make impossible: The insufficiency of the evidence precludes a conviction.
blood transfusion — A blood transfusion is a process in which blood is injected into the body of a person who is badly injured or ill.
disillusion — to free from or deprive of illusion, belief, idealism, etc.; disenchant.
heat of fusion — the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature: equal to the heat of solidification.