As Latter-Day-Saints we don't disagree with the use of the word 'love' necessarily, but our 'further light of understanding' in the Book of Mormon and the Doctrine and Covenants adds some valuable information that helps us understand more about what Paul meant when he called charity the most important of the three 'theological virtues'.  When Mormon defines charity as the 'pure love of Christ' the word takes on a much greater meaning then the way the word is generally defined by the world today.   But I, for one, was still inclined to use the two words 'love' and 'charity' interchangeably except in degree because our Bible Dictionary tells us that charity is 'the highest form of love'.    So there is charity, as in  doing good for and giving to others which is mentioned in 1 Cor. 13, but only as a part of charity; there is love of God and love of ourselves and our fellow men, as in the first and second greatest commandments; and then there is this higher and purer form of love which is directly tied to Christ.  So then, what did Joseph Smith mean in D & C 4 when he lists 'faith, hope, charity and love with an eye single to the glory of God' as qualities which qualify us for the work?   Now, there are four 'theological virtues' to master, but first we have to understand what they really are.  (And perhaps five if you count: 'with an eye single to the glory of God' which isn't quite as simple a thought when you really begin to examine it.)