gravel vs mystify

gravel is a noun but mystify is not a noun.

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

As verbs, gravel and mystify are synonyms defined as:

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

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

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