There is a four-letter word beginning in "f" that also is a noun, verb, adverb, adjective, oh yeah, and an exclamaition!
Although, the "f" word is all of these in slang......but still.....it can be used in it's own sentance as the noun, verb, adjective, and adverb......and somehow, people will get the idea of what you're saying......
So, peace out, homie, and WORD UP!