There’s always more than one way to ask a question. Consider synonyms and semantic variations on keywords describing your services. Google’s RankBrain technology recognizes synonyms and expands their search results accordingly. Google also punishes websites for stuffing their content with repetitive keywords. Synonyms and variations can help you to reach a larger audience and avoid Google penalties for keyword stuffing.
Of all the tools listed in this article, Moz Link explorer is an old one & quite popular. If you want to compare backlinks between two or more domains, Open Site Explorer is worth trying. This tool works best when you have a paid account of SEOMOZ though a free version of this tool is good enough to get you started checking the backlinks of your site and the sites of your competitors.