nonplus vs gravel

nonplus is not a noun while gravel is a noun.

Word	Noun	Adjective	Verb	Adverb
nonplus	No	No	Yes	No
gravel	Yes	No	Yes	No

As verbs, nonplus and gravel are synonyms defined as:

Other synonyms of nonplus include amaze, baffle, beat, bewilder, dumbfound, flummox, get, mystify, perplex, pose, puzzle, stick, stupefy, vex.

nonplus (noun)	gravel (noun)
	rock fragments and pebbles

nonplus (verb)	gravel (verb)
be a mystery or bewildering to	be a mystery or bewildering to
	cover with gravel
	cause annoyance in; disturb, especially by minor irritations