son of a bitch vs dickhead

son of a bitch and dickhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
son of a bitch	Yes	No	No	No
dickhead	Yes	No	No	No

As nouns, son of a bitch and dickhead are synonyms defined as:

son of a bitch and dickhead: insulting terms of address for people who are stupid or irritating or ridiculous

Other synonyms of son of a bitch include asshole, bastard, cocksucker, mother fucker, motherfucker, prick, shit, SOB, whoreson.

son of a bitch (noun)	dickhead (noun)
insulting terms of address for people who are stupid or irritating or ridiculous	insulting terms of address for people who are stupid or irritating or ridiculous