Lexical development

• Katherine Nelson 1973


  60% of the first 50 words are nouns
• Saxton 2010


  Food, Family, Animals, Body, Clothing, Transport, Routines, Toys, Household, Actions, Being, Sounds
• Rescorla


  Top 25 words a child ought to know by 2
• Hypernym 


  The superordinate term
• Hyponym


  The detailed sub-category
• Categorical overextension 


  Mistakenly using the hyponym instead of the hypernym
• Analogical overextension 


  Using a hyponym for an object that has similarities (eg calling the moon a ball)
• Underextension


  Using a hypernym as a hyponym (eg. Doggie only refers to one specific dog)