assail vs bulldog

assail is not a noun while bulldog is a noun.

Word	Noun	Adjective	Verb	Adverb
assail	No	No	Yes	No
bulldog	Yes	No	Yes	No

As verbs, bulldog is a hyponym of assail; that is, bulldog is a word with a more specific, narrower meaning than assail:

assail (noun)	bulldog (noun)
	a sturdy thickset short-haired breed with a large head and strong undershot lower jaw; developed originally in England for bull baiting

assail (verb)	bulldog (verb)
attack in speech or writing	attack viciously and ferociously
attack someone physically or emotionally	throw a steer by seizing the horns and twisting the neck, as in a rodeo
launch an attack or assault on; begin hostilities or start warfare with