Similar words
estufa
calentador and estufa are close synonyms for "heater"; estufa also separately means "stove."
Similar in other languages
Portuguese
aquecedor
aquecedor is the Portuguese word for the same thing — both mean "heater."
Practice
1 What does calentador mean?
heater
2 Fill the gap: Enciende el ___ de agua.
Full sentence: Enciende el calentador de agua. (Turn on the water heater.)
3 Which fingerprint chart matches calentador?
calentador: neutral register, common frequency, general domain, neutral connotation.