Noun

• S: (n) boiler, steam boiler (sealed vessel where water is converted to steam)
• direct hyponym / full hyponym
• S: (n) auxiliary boiler, donkey boiler ((nautical) an extra boiler (as a ship's boiler that is used while the ship is in port))
• part meronym
• S: (n) steam whistle (a whistle in which the sound is produced by steam; usually attached to a steam boiler)
• member meronym
• direct hypernym / inherited hypernym / sister term
• S: (n) vessel (an object used as a container (especially for liquids))
• S: (n) container (any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another))
• S: (n) instrumentality, instrumentation (an artifact (or system of artifacts) that is instrumental in accomplishing some end)
• S: (n) artifact, artefact (a man-made object taken as a whole)
• S: (n) whole, unit (an assemblage of parts that is regarded as a single entity) "how big is that part compared to the whole?"; "the team is a unit"
• S: (n) object, physical object (a tangible and visible entity; an entity that can cast a shadow) "it was full of rackets, balls and other objects"
• S: (n) physical entity (an entity that has physical existence)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• part holonym
• S: (n) heating system, heating plant, heating, heat (utility to warm a building) "the heating system wasn't working"; "they have radiant heating"
• S: (n) steam engine (external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder)
• derivationally related form
• S: (n) kettle, boiler (a metal pot for stewing or boiling; usually has a lid)