spittle vs drivel

spittle and drivel both are nouns.

Word	Noun	Adjective	Verb	Adverb
spittle	Yes	No	No	No
drivel	Yes	No	Yes	No

As nouns, drivel is a hyponym of spittle; that is, drivel is a word with a more specific, narrower meaning than spittle:

spittle: a clear liquid secreted into the mouth by the salivary glands and mucous glands of the mouth; moistens the mouth and starts the digestion of starches
drivel: saliva spilling from the mouth

Other hyponyms of spittle include dribble, drool, slobber, tobacco juice.

spittle (noun)	drivel (noun)
a clear liquid secreted into the mouth by the salivary glands and mucous glands of the mouth; moistens the mouth and starts the digestion of starches	saliva spilling from the mouth
	a worthless message

spittle (verb)	drivel (verb)
	let saliva drivel from the mouth