saliva vs drivel

saliva and drivel both are nouns.

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

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

saliva: 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 saliva include dribble, drool, slobber, tobacco juice.

saliva (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

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