There was a recent interview of Fleming tho it was filmed many years ago. the interviewer asked why Fleming never used 4 letter words in his books.
Fleming said it was probably his Scottish ancestors who would not have approved. Then he said he just didn’t like to see four letter words in books.
He would put in some slightly silly words for characters such as Pussy Galore and Plenty O’Toole.
Though he did "bleep" them on occasion:
Bond said politely, "Then you can go and —— yourself." He expelled all the breath from his lungs and closed his eyes.
"Even I am not capable of that, Mr Bond," said Goldfinger with good humour.
This exchange was unfilmable in the 1960s, so in the movie it became the much more memorable, "Do you expect me to talk, Goldfinger?" "No, Mr. Bond, I expect you to die."
In fact, Goldfinger the movie was a big improvement in general over Goldfinger the novel, in which Goldfinger plans to rob Fort Knox by blowing the doors off with a nuke (while hiding behind a wall). The plan in the film to irradiate all the gold inside is somewhat more plausible.