puzzle vs gravel

puzzle and gravel both are nouns.

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

As verbs, puzzle and gravel are synonyms defined as:

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

puzzle (noun)	gravel (noun)
a game that tests your ingenuity	rock fragments and pebbles
a particularly baffling problem that is said to have a correct solution

puzzle (verb)	gravel (verb)
be a mystery or bewildering to	be a mystery or bewildering to
be uncertain about; think about without fully understanding or being able to decide	cover with gravel
	cause annoyance in; disturb, especially by minor irritations