tinsel vs embellish

tinsel is a noun but embellish is not a noun.

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

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

Other hypernyms of tinsel include adorn, beautify, decorate, grace, ornament.

tinsel (noun)	embellish (noun)
a thread with glittering metal foil attached
a showy decoration that is basically valueless

tinsel (verb)	embellish (verb)
interweave with tinsel	make more beautiful
adorn with tinsel	add details to
impart a cheap brightness to	make more attractive by adding ornament, colour, etc.
	be beautiful to look at