mystify vs gravel

mystify is not a noun while gravel is a noun.

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

As verbs, mystify and gravel are synonyms defined as:

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

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

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