Related Clues:

• Cast or oil, sometimes
• As such, there's no difference between best and worst
• "Push" or "pull," perhaps
• Word such as "word"
• One may precede a verb
• "Cross," "word" or "crossword," say
• What "is" is
• Nature or nurture
• It may be a thing
• Barn or sound
• Cat, catalog, or catcher, e.g
• Be, beg, or betray, e.g
• Any word ending with "ism"
• Proper part of speech?
• Win or lose