embellish vs improve

embellish and improve both are verbs.

Word	Noun	Adjective	Verb	Adverb
embellish	No	No	Yes	No
improve	No	No	Yes	No

As verbs, improve is a hypernym of embellish; that is, improve is a word with a broader meaning than embellish:

Other hypernyms of embellish include ameliorate, amend, better, meliorate.

embellish (verb)	improve (verb)
make more beautiful	get better
add details to	to make better
make more attractive by adding ornament, colour, etc.
be beautiful to look at