gismo vs mod con

gismo and mod con both are nouns.

Word	Noun	Adjective	Verb	Adverb
gismo	Yes	No	No	No
mod con	Yes	No	No	No

As nouns, mod con is a hyponym of gismo; that is, mod con is a word with a more specific, narrower meaning than gismo:

gismo: a device or control that is very useful for a particular job
mod con: modern convenience; the appliances and conveniences characteristic of a modern house

Other hyponyms of gismo include gadgetry, gimbal, injector.

gismo (noun)	mod con (noun)
a device or control that is very useful for a particular job	modern convenience; the appliances and conveniences characteristic of a modern house
something unspecified whose name is either forgotten or not known