Scurrilous vs Assailant - What's the difference?

As adjectives the difference between scurrilous and assailant

is that scurrilous is given to vulgar verbal abuse; foul-mouthed while assailant is assailing; attacking.

someone who attacks or assails another violently, or criminally; an attacker.

(en adjective)

(of a person) given to vulgar verbal abuse; foul-mouthed

(of language) coarse, vulgar, abusive, or slanderous

* 2014 July 29, " On chutzpah and war," Aljazeera.com (retrieved 29 July 2014):

Perhaps the greatest chutzpah is the term itself, moving from scurrilous origins to something admirable.

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(en noun)

Someone who attacks or assails another violently, or criminally; an attacker.

(figuratively, by extension) A hostile critic or opponent.

(-)

Assailing; attacking.

(Milton)