What is the difference between 'advice' and 'suggestion'?

Answer 1

Dictionary.com defines the two words as follows:

advice: an opinion or recommendation offered as a guide to action, conduct, etc.: I shall act on your advice.

suggestion: to mention or introduce (an idea, proposition, plan, etc.) for consideration or possible action: The architect suggested that the building be restored.

If you take the two words in context, to give advice means to offer resolution to a problem by way of action.

A suggestion, on the other hand, is the introduction of a new ideaology or framework.

Answer 2

On the surface these words appear to mean very much the same. However, a suggestion seems to be more of a friendly, informal presentation which may allow further discussion. A suggestion may not necessarily be the right answer and may attract alternative views. Advice is more of a recommendation as to the appropriate choice of action, is is more formal. Those giving advice are thought to have more experience that those offering a mere suggestion. The historical interpretation of the word 'advice' from Latin, falls nearer to a direct request to take action rather than 'suggestion' which has no particular request for action, just a general view