ululate vs yawl

ululate is not a noun while yawl is a noun.

Word	Noun	Adjective	Verb	Adverb
ululate	No	No	Yes	No
yawl	Yes	No	Yes	No

As verbs, ululate and yawl are synonyms defined as:

Other synonyms of ululate include howl, roar, wail, yaup.

ululate (noun)	yawl (noun)
	a sailing vessel with two masts; a small mizzen is aft of the rudderpost
	a ship's small boat (usually rowed by 4 or 6 oars)

ululate (verb)	yawl (verb)
emit long loud cries	emit long loud cries