Number of words: 109

‘Can A Word Be Its Own Opposite?’  Yes! They are called ‘Contronyms’—words that are their own antonyms, depending on usage. Here are a few examples 

‘Dust’ : can mean ‘to add fine particles’ or ‘to remove fine particles’. 

‘Left’ : can mean both ‘remaining’ and ‘departed’.

‘Off’ : can mean both ‘activated’ and ‘deactivated’.  Eg:- “Set off” – Activated,    “ Switch off – Deactivated

‘Oversight’ : means both ‘watchful care’ and ‘an inadvertent error’. 

‘Screen’ :  can mean both ‘to show’ and ‘to hide’.

‘Sanction’ can mean both ‘a penalty for disobeying a law’ and ‘official permission or approval for an action.