The term 'burning fiercely' can be summarized by two crossword solutions: 'BLAZING' (7 letters) and 'ABLAZE' (6 letters). Both words refer to something that is burning with a great intensity. 'BLAZING' is an adjective that describes something that is burning brightly and fiercely, while 'ABLAZE' is an adverb that describes the manner in which something is burning. Both words are often used to describe fires, but they can also be used to describe other things that are burning with a great intensity.