electric pig vs garbage disposal

electric pig and garbage disposal both are nouns.

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

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

electric pig and garbage disposal: a kitchen appliance for disposing of garbage

Other synonyms of electric pig include disposal.

electric pig (noun)	garbage disposal (noun)
a kitchen appliance for disposing of garbage	a kitchen appliance for disposing of garbage