crock

(noun) a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink. Synonyms: carbon black, lampblack, soot, smut.

(noun) nonsense; foolish talk. Example: "That's a crock."

(noun) an earthen jar (made of baked clay). Synonyms: earthenware jar.

(verb) release color when rubbed, of badly dyed fabric.

(verb) soil with or as with crock.