The term 'DECK TOP' is composed of two words, 'DECK' and 'TOP'. The first word, 'DECK', is a noun meaning a flat surface, usually outdoors, that forms part of the structure of a ship or building. The second word, 'TOP', is an adjective meaning highest in rank or most important. The crossword solution for this term is 'ACE', which is a noun meaning a playing card with a single pip or symbol on it, ranking highest in its suit.