General terms:
* -hood: This suffix is commonly used to denote a state or condition, like childhood, womanhood, etc. So, "motherhood" is a widely accepted term for the state of being a mother.
* -ship: This suffix also denotes a state or condition, though often with a sense of belonging or membership. "Mothership" is less common than "motherhood" but is used in some contexts.
More specific terms:
* -dom: This suffix is used for a state of being, particularly a dominant or controlling one. "Motherdom" is not a common term, but it could be used to emphasize the role of the mother as the primary caregiver.
* -ness: This suffix implies a quality or characteristic. "Motherliness" is more commonly used to refer to the qualities associated with being a mother, rather than the state itself.
Other options:
* "being a mother" is a straightforward and clear way to describe the state.
* "mothering" refers to the act of being a mother, rather than the state itself.
Ultimately, the best term to use depends on the specific context and the desired meaning.