spiff up vs spruce

spiff up is not a noun while spruce is a noun.

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

As verbs, spiff up and spruce are synonyms defined as:

Other synonyms of spiff up include slick up, smarten up, spruce up, titivate, tittivate.

spiff up (noun)	spruce (noun)
	any coniferous tree of the genus Picea
	light soft moderately strong wood of spruce trees; used especially for timbers and millwork

spiff up (adjective)	spruce (adjective)
	marked by up-to-dateness in dress and manners

spiff up (verb)	spruce (verb)
make neat, smart, or trim	dress and groom with particular care, as for a special occasion
	make neat, smart, or trim