There are gradable pairs of antonyms
words like bear and bare are homonyms (also called homophones).
Homonyms are words that have different meanings but are pronounced the same, and may or may not be spelled the same.
(They're homographs when spelled the same, but when homographs are pronounced differently like pussy meaning "infected" or pussy meaning "kitten," they are called heteronyms rather than homonyms.) Near nonsense sentences like Entre nous, the new gnu knew nu is a Greek letter tease us with homonyms. The humor in the cartoon above is based on the homonyms walk and work.