Starting from filing police complaint for use of abusive words.
But going on practical method, show indirect resentment by polite objection to such words.
If he addresses anyone in rude or abusive way, person concerned needs to pretend he has not heard and ignore his words.
If repeated, tell him ok Sir you were telling me something.
One will have to be diplomatic and smart to convey things and unhappiness about language which is disrespectful.
It is better to convey things when he is in happy mood but do not lump such abuses.
He is employer not your Supreme master or dictator who can do what he wants.
1) Make an official complaint to his superior or the top most in the company- mentioning that the behaviour of your boss is obnoxious and in violation of general conduct rules- it causes mental trauma and stress to you and creates a intimidating and hostile environment.
2) I m sure some of these abusive words would be with sexual remarks/connotation. You can very well file a complaint under Prevention of Sexual harassment at work place act.
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First you clear one thing and take assurance from employees before taking any action against him, as may be just because of loss of job or fear, they step backwards in front of police or any other authorised person. But being an HR person you have the right to speak with him and share your concern in a polite and official way if things do not go fine then go for other steps. If he is abusing you then you can have full right to speak against him and take any action, but for other should get surety.