Common words:
* Maternal: Relating to a mother
* Maternalism: The state of being a mother
* Maternalistic: Characteristic of a mother
* Materially: Relating to material things
* Materialism: The belief that material things are most important
* Maternal instinct: The natural urge to care for offspring
* Maternal love: The love of a mother for her children
Less common words:
* Mater: A goddess, especially the Roman goddess of motherhood
* Materfamilias: The female head of a family
* Matriarch: A woman who is the head of a family or tribe
* Maternalism: A policy of favoring the interests of mothers
* Material: The physical substance of which something is made
* Materialization: The act of becoming material
* Maternalization: The process of becoming a mother
* Matriculate: To be admitted to a university or college
Other words:
* Almater: A university or college that a person has attended
* Alma Mater: A woman's alma mater
Note: There are also words with "mater" in other languages, such as "mater" in Spanish, meaning "mother".