electrotherapy vs ECT

electrotherapy and ECT both are nouns.

Word	Noun	Adjective	Verb	Adverb
electrotherapy	Yes	No	No	No
ECT	Yes	No	No	No

As nouns, ECT is a hyponym of electrotherapy; that is, ECT is a word with a more specific, narrower meaning than electrotherapy:

electrotherapy: the therapeutic application of electricity to the body (as in the treatment of various forms of paralysis)
ECT: the administration of a strong electric current that passes through the brain to induce convulsions and coma

Other hyponyms of electrotherapy include electroconvulsive therapy, electroshock, electroshock therapy.

electrotherapy (noun)	ECT (noun)
the therapeutic application of electricity to the body (as in the treatment of various forms of paralysis)	the administration of a strong electric current that passes through the brain to induce convulsions and coma