smoothen vs sandblast

smoothen is not a noun while sandblast is a noun.

Word	Noun	Adjective	Verb	Adverb
smoothen	No	No	Yes	No
sandblast	Yes	No	Yes	No

As verbs, sandblast is a hyponym of smoothen; that is, sandblast is a word with a more specific, narrower meaning than smoothen:

Other hyponyms of smoothen include strip, launch, rake, plane, float, sand, sandpaper, file.

smoothen (noun)	sandblast (noun)
	a blast of wind laden with sand

smoothen (verb)	sandblast (verb)
become smooth	grind with a sandblast
make smooth or smoother, as if by rubbing
make (a surface) shine