The equality and human rights commission are bringing some changes in terminology about. Equality 'groups', 'streams', and 'strands' have become 'mandates' which refers directly to the legislation and the mandates of the commission but everybody else seems to want to stick with 'strands'.
Also used are 'disadvantaged', 'minority' (which also includes women), and 'under-represented' but this varies according to context. 'vulnerable' groups in relation to equality isn't liked by the disability movement but is often used in reference to exploited groups of workers or to people with learning disabilities. So complicated. Ad astra per aspera