electric pig vs disposal

electric pig and disposal both are nouns.

Word	Noun	Adjective	Verb	Adverb
electric pig	Yes	No	No	No
disposal	Yes	No	No	No

As nouns, electric pig and disposal are synonyms defined as:

Other synonyms of electric pig include garbage disposal.

electric pig (noun)	disposal (noun)
a kitchen appliance for disposing of garbage	the act or means of getting rid of something
	a method of tending to or managing the affairs of some group of people (especially the group's business affairs)
	a kitchen appliance for disposing of garbage
	the power to use something or someone