Where does this definition of four-letter come from?
This entry for four-letter is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is four-letter a noun, verb, or something else?
In this entry, four-letter is tagged as 2adj..
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.