Nubbly is almost knobbly but more blunt and stubby. I got to know this word from Rudyard Kipling’s Just So Story, How The Whale Got His Throat. The whale asks the Stute Fish what man tastes of. “Nice,” says the Stute Fish. “Nice, but nubbly.”

My computer says it comes from the 19th century word, nubble – being a stumpy, knob-like thing – but I can’t find it in any other dictionaries. I think nubble is a lovely word and should be used. Perhaps it could take on the engineer’s meaning of nipple and so relieve schoolboys of embarrassment or mirth when replacing their bicycle gear and brake cables.

Learn a new word every day.
Repeat it and remind yourself what it means at least three times in a day.
Try to use the word in conversation or writing today.
Get a dictionary and look words up.