spiff up vs embellish

spiff up and embellish both are verbs.

Word	Noun	Adjective	Verb	Adverb
spiff up	No	No	Yes	No
embellish	No	No	Yes	No

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

Other hypernyms of spiff up include beautify, fancify, prettify.

spiff up (verb)	embellish (verb)
make neat, smart, or trim	make more beautiful
	add details to
	make more attractive by adding ornament, colour, etc.
	be beautiful to look at