Are there differences between an ashkenazi, sephardi and teymani sefer torah in terms of the words? Are any words different between the sifrei torah of these different communities?
There are a number of small differences between the different traditions of writing a Sefer Torah.
The most renowned difference is the writing of the word “dakha” of “petzua dakha” in Devarim 23:2 (whether it is written with an aleph or with a hei) – though today many Ashkenazi sefarim also write the word with a hei – but there are also a number of other differences.
The different versions can be seen here.