synonyms

Hi everyone, I have 2 random, totally unrelated questions that are bugging me, so here it goes... 1) does anyone know whether DuckDuckGo have been purchased by Google yet? The reason I'm asking this is because until a month or so ago I would usually get different results in DDG vs Google, but...

Please help me, I have a question on wich I just can't get my hands around. How can some one best build onsite seo (h1 tags, internal links etc) for 2 keywords wich means the same. I know google will see synonyms as related (for example: blackberry and bb). But how about horse - pony or world...