Related Clues:

• They're often common objects
• Track and field, e.g
• ''Proper'' parts of speech
• E-I-E-I-O
• ''Hide'' and ''seek''
• Animal, vegetable, and mineral, e.g
• They carry substantive rank
• Common sense shown about name or names
• Words indicating names
• Can't be proper if they are common
• Naming words
• They supply all the action in the story
• Themes of the puzzle (as one word, or two)
• Identifying words
• Lions and tigers ... and bears, sometimes?