snake in the grass vs snake

snake in the grass and snake both are nouns.

Word	Noun	Adjective	Verb	Adverb
snake in the grass	Yes	No	No	No
snake	Yes	No	Yes	No

As nouns, snake in the grass and snake are synonyms defined as:

snake in the grass (noun)	snake (noun)
a deceitful or treacherous person	limbless scaly elongate reptile; some are venomous
	something long, thin, and flexible that resembles a snake
	a long flexible steel coil for dislodging stoppages in curved pipes
	a deceitful or treacherous person

snake in the grass (verb)	snake (verb)
	move along a winding path
	move smoothly and sinuously, like a snake
	form a snake-like pattern