smarten up vs spruce

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

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

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

smarten up and spruce: dress and groom with particular care, as for a special occasion

Other synonyms of smarten up include slick up, spruce up.

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

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

smarten 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

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

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