demo vs expression

demo and expression both are nouns.

Word	Noun	Adjective	Verb	Adverb
demo	Yes	No	Yes	No
expression	Yes	No	No	No

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

Other hyponyms of demo include display, show, manifestation, reflection, reflexion, exemplification, illustration.

demo (noun)	expression (noun)
a visual presentation showing how something works	the act of forcing something out by squeezing or pressing
	the feelings expressed on a person's face
	a word or phrase that particular people use in particular situations
	the style of expressing yourself
	expression without words
	a group of symbols that make a mathematical statement
	the communication (in speech or writing) of your beliefs or opinions
	a group of words that form a constituent of a sentence and are considered as a single unit
	(genetics) the process of expressing a gene

demo (verb)	expression (verb)
give an exhibition of to an interested audience