Specifically, I'm thinking of 平等, 同等, 対等, 均等, and 互角. I understand that 互角 is usually referring to a small number of things which are really close (seemingly usually in competitions). 同等, according to goo, is subjective equality of degree, and 対等 is equality of abilities. 均等 is about distribution of something (treatment, money, etc), and 平等 usually seems to be about fairness.
But what is the differences between 対等 and 互角? How is 対等 different from 均一? When 対等 is about "treatment" it seems like it is just like 平等. And is there anything else I'm missing from the others?