gravel vs nonplus

gravel is a noun but nonplus is not a noun.

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

As verbs, gravel and nonplus are synonyms defined as:

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

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

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