shithead

As nouns the difference between fuckhead and shithead

is that fuckhead is (vulgar|pejorative) a stupid or otherwise undesirable person while shithead is (pejorative|slang|vulgar) a stupid or contemptible person.

As nouns the difference between shithead and shitload

is that shithead is (pejorative|slang|vulgar) a stupid or contemptible person while shitload is (vulgar|slang) a large amount.

As a noun shithead is

(pejorative|slang|vulgar) a stupid or contemptible person.

As nouns the difference between douchebag and shithead

is that douchebag is a sterile container which holds the fluid used for giving a vaginal douche while shithead is a stupid or contemptible person.

As an adjective obnoxious

is extremely unpleasant, offensive, very annoying, odious or contemptible.

As a noun shithead is

(pejorative|slang|vulgar) a stupid or contemptible person.

As nouns the difference between taxonomy and shithead

is that taxonomy is the science or the technique used to make a classification while shithead is (pejorative|slang|vulgar) a stupid or contemptible person.

As nouns the difference between shithead and dumbass

is that shithead is a stupid or contemptible person while dumbass is a stupid or foolish person.

As an adjective dumbass is

stupid, foolish.

Shitass is a synonym of shithead.

As nouns the difference between shithead and shitass

is that shithead is a stupid or contemptible person while shitass is a jerk; an inappropriately or objectionably mean, inconsiderate, contemptible, obnoxious, intrusive, or rude person.

Shithead is a synonym of shitfuck.

As nouns the difference between shithead and shitfuck

is that shithead is (pejorative|slang|vulgar) a stupid or contemptible person while shitfuck is (vulgar) a stupid or otherwise undesirable person.

As an adjective shitfuck is

(vulgar) extremely bad.