String base1 = "fast";
        String syn1 = "rapid";
        String base2 = "slow";
        String syn2 = "sluggish";


        SynonymMap.Builder sb = new SynonymMap.Builder(true);
        sb.add(new CharsRef(base1), new CharsRef(syn1), true);
        sb.add(new CharsRef(base2), new CharsRef(syn2), true);
        SynonymMap smap = sb.build();