add-on vs element

add-on and element both are nouns.

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

As nouns, element is a hypernym of add-on; that is, element is a word with a broader meaning than add-on:

add-on: a component that is added to something to improve it
element: an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system

Other hypernyms of add-on include component, constituent.

As nouns, element is a hypernym of add-on; that is, element is a word with a broader meaning than add-on:

add-on: a supplementary component that improves capability
element: an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system

Other hypernyms of add-on include component, constituent.

add-on (noun)	element (noun)
a component that is added to something to improve it	an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system
a supplementary component that improves capability	an abstract part of something
a software module that extends or enhances the capabilities of an existing application	the most favorable environment for a plant or animal
	a straight line that generates a cylinder or cone
	the situation in which you are happiest and most effective
	any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
	one of four substances thought in ancient and medieval cosmology to constitute the physical universe