Look at the following concordances (or retrive your own set from the corpus) and see if you can discern any patterns. Some questions to help you:

• What are the most frequent collocations with either word?
• Is the meaning of ill the same when it is used predicatively and not?

Cf.

• The fear on colleges of ill consequences from overwork in such circumstances was not avoided.
• All I don't like is, rags, ill taste, ill-shapes….
• The potential for ill considered actions is great with sections.
• YOUR story about the seriously ill children's trip to Disney World was really touching.
• ‘God, I feel ill,’ he muttered, and rasped his hand over his chin.
• I was not ill, but nearly died of my own neglect,

Further illustrations: [sick], [ill],