Greatest
Part of speech: adjective
Definition: Relatively large in scale, size, extent, number (i.e. having many parts or members) or duration (i.e. relatively long); very big.
Example sentence: The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.
Sterling
Part of speech: adjective
Definition: of, or relating to British currency, or the former British coinageof, relating to, or made from sterling silverhigh quality
Part of speech: noun
Definition: the currency of the United Kingdom; especially the poundformer British gold or silver coinage of a standard fineness: for gold 0.91666 and for silver 0.925.sterling silver, or articles made from this material