bulldog vs assail

bulldog is a noun but assail is not a noun.

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

As verbs, assail is a hypernym of bulldog; that is, assail is a word with a broader meaning than bulldog:

Other hypernyms of bulldog include assault, attack, set on.

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

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