add-on vs extension

extension vs add-on

add-on and extension both are nouns.

Word	Noun	Adjective	Verb	Adverb
add-on	Yes	No	No	No
extension	Yes	No	No	No

As nouns, extension is a hyponym of add-on; that is, extension is a word with a more specific, narrower meaning than add-on:

add-on: a component that is added to something to improve it
extension: an addition that extends a main building

Other hyponyms of add-on include additive, afterthought, annex, annexe, wing, attachment, elongation.

add-on (noun)	extension (noun)
a component that is added to something to improve it	an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
a supplementary component that improves capability	act of stretching or straightening out a flexed limb
a software module that extends or enhances the capabilities of an existing application	act of expanding in scope; making more widely available
	an addition that extends a main building
	an addition to the length of something
	an additional telephone set that is connected to the same telephone line
	amount or degree or range to which something extends
	the ability to raise the working leg high in the air
	the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
	a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
	the spreading of something (a belief or practice) into new regions
	a mutually agreed delay in the date set for the completion of a job or payment of a debt

Difference between add-on and extension

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